Usage of the character 二

Jung Chang 張戎／张戎 ( Zhāng Róng) (1952-), British-Chinese writer, author of Wild Swans 野天鵝／野天鹅 ( Yě Tiān'é) and Mao: The Unknown Story 毛澤東·鮮為人知的故事／毛泽东·鲜为人知的故事 ( Máo Zédōng· Xiānwéirénzhīde Gùshi)

èrgānzi

二杆子

[二杆子]

hot-tempered
rash
hot-tempered person

bǐng'èrchún

丙二醇

[丙二醇]

propylene glycol
propane-1,2-diol C3H6(OH)2

dīng'èrxī

丁二烯

[丁二烯]

butadiene C4H6
biethylene

èrtóujī

二头肌

[二頭肌]

biceps muscle

èrhūntóu

二婚头

[二婚頭]

remarried lady (contemptuous term)
lady who marries for a second time

Běi Erwài

北二外

[北二外]

abbr. for 北京第二外國語學院／北京第二外国语学院 ( Běijīng Dì'èr Wàiguóyǔ Xuéyuàn)

dì'èrtiān

第二天

[第二天]

next day
the morrow

Nánmén'èr

南门二

[南門二]

Alpha Centauri or Rigel Kentaurus

èrděngchē

二等车

[二等車]

second-class carriage (of a train)

qióng'èrdài

穷二代

[窮二代]

those who did not benefit from the Chinese economic reforms of the 1980s
see also 富二代 (fù'èrdài)

èrlángtuǐ

二郎腿

[二郎腿]

one leg over the other (legs crossed)

Qín Ershì

秦二世

[秦二世]

Qin Ershi (229-207 BC), second Qin emperor

èrmíngfǎ

二名法

[二名法]

binomial nomenclature (taxonomy)

èrniánshēng

二年生

[二年生]

biennial (botany)

èrchóngxìng

二重性

[二重性]

dualism
two sided
double nature

èrchónggēn

二重根

[二重根]

a double root of an equation

èrèyīng

二恶英

[二惡英]

dioxin

èrshíduō

二十多

[二十多]

over 20

èrliújiàn

二硫键

[二硫鍵]

disulfide (chemistry)

èrfēnliè

二分裂

[二分裂]

binary division (in bacterial reproduction)

jīng'èrhú

京二胡

[京二胡]

jing'erhu, a two-stringed fiddle intermediate in size and pitch between the jinghu 京胡 and erhu 二胡, used to accompany Chinese opera
also called 京胡

èrhéyī

二合一

[二合一]

2-in-1
two-in-one

Erdàojiāng

二道江

[二道江]

Erdaojiang district of Tonghua city 通化市, Jilin

èrguōtóu

二锅头

[二鍋頭]

erguotou (sorghum liquor)

shí'èrjīng

十二经

[十二經]

twelve channels of TCM

Erqī Qū

二七区

[二七區]

Erqi District of Zhengzhou City 鄭州市／郑州市 ( Zhèngzhōu Shì), Henan

sìyī'èr

四一二

[四一二]

12th April
refers to Chiang Kai-shek's coup of 12th April 1927 against the communists in Shanghai

dì'èrcì

第二次

[第二次]

the second time
second
number two

Dì'èrxìng

第二性

[第二性]

The Second Sex (book by Simone de Beauvoir)

Xīngqī'èr

星期二

[星期二]

Tuesday

xīng'èrdài

星二代

[星二代]

children of celebrities

dì'èrshēng

第二声

[第二聲]

second tone in Mandarin
rising tone

èrshǒuhuò

二手货

[二手貨]

second-hand goods
used goods

shí'èrgōng

十二宫

[十二宮]

the twelve equatorial constellations or signs of the zodiac in Western astronomy and astrology, namely: Aries 白羊 ( Báiyáng), Taurus 金牛 ( Jìnniú), Gemini 雙子／双子 ( Shuāngzǐ), Cancer 巨蟹 ( Jùxiè), Leo 獅子／狮子 ( Shīzǐ), Virgo 室女 ( Shìnü), Libra 天秤 ( Tiānchèng), Scorpio 天蠍／天蝎 ( Tiānxiē), Sagittarius 人馬／人马 ( Rénmǎ), Capricorn 摩羯 ( Mójié), Aquarius 寶瓶／宝瓶 ( Bǎopíng), Pisces 雙魚／双鱼 ( Shuāngyú)

èrgānchún

二甘醇

[二甘醇]

diethylene glycol
glycerin (used in antifreeze)

èrwéimǎ

二维码

[二維碼]

2D barcode; matrix code
(esp.) QR code

Tǔwèi Er

土卫二

[土衛二]

Enceladus (moon of Saturn), aka Saturn II

Erlángshén

二郎神

[二郎神]

Erlangshen, Chinese deity

bù'èrjià

不二价

[不二價]

one price for all
fixed price

èrdìzhǔ

二地主

[二地主]

sublandlord
tenant who sublets

èrguòyī

二过一

[二過一]

(soccer) one-two
push-and-run

èrcìfāng

二次方

[二次方]

square (i.e. x times x)

dú'èrdài

独二代

[獨二代]

second generation only child

èrshǒufáng

二手房

[二手房]

second-hand house
house acquired indirectly through a middle-man

èrchóngchàng

二重唱

[二重唱]

duet

bāo'èrnǎi

包二奶

[包二奶]

to cohabit with and financially support a mistress

Erlín Zhèn

二林镇

[二林鎮]

Erlin or Erhlin Town in Changhua County 彰化縣／彰化县 ( Zhānghuà Xiàn), Taiwan

èrshuǐhuò

二水货

[二水貨]

used goods
second hand goods

èrděngcāng

二等舱

[二等艙]

second class cabin

fù'èrdài

富二代

[富二代]

children of entrepreneurs who became wealthy under Deng Xiaoping's economic reforms in the 1980s
see also 窮二代／穷二代 (qióng'èrdài)

diànxiǎo'èr

店小二

[店小二]

(old) (in a tavern or inn etc) waiter
attendant

èrjùtǐ

二聚体

[二聚體]

dimer (chemistry)

Erdiéjì

二迭纪

[二迭紀]

Permian (geological period 292-250m years ago)
also written 二疊紀／二叠纪

èrcìxíng

二次型

[二次型]

quadratic form (math.)

èrbèitǐ

二倍体

[二倍體]

diploid (in cell biology)

èrbǎiwǔ

二百五

[二百五]

idiot
stupid person
a dope

èrjìnzhì

二进制

[二進制]

binary system (math.)

yǐ'èrchún

乙二醇

[乙二醇]

glycol
ethylene glycol C2H4(OH)2 (antifreeze)

èrshǒuchē

二手车

[二手車]

second-hand car

èrāyí

二阿姨

[二阿姨]

auntie, second eldest of sisters in mother's family

èrlúnpiàn

二轮片

[二輪片]

second-run movie

èrcházuì

二茬罪

[二茬罪]

to suffer second persecution

èrliúzi

二流子

[二流子]

loafer
idler
bum

Mùwèi Er

木卫二

[木衛二]

Europa (moon of Jupiter), aka Jupiter II

dì'èrlún

第二轮

[第二輪]

second round (of match, or election)

bā'èrdān

八二丹

[八二丹]

eight-to-two powder (TCM)

èrmuzhǐ

二拇指

[二拇指]

index finger

èrxiàngshì

二项式

[二項式]

two items
binomial (math.)

Shí'èryuè

十二月

[十二月]

December
twelfth month (of the lunar year)

èrbǎshǒu

二把手

[二把手]

deputy leader
the second-in-command

èrlü'àn

二氯胺

[二氯胺]

dichloramine

èryuèfèn

二月份

[二月份]

February

èrfēndiǎn

二分点

[二分點]

the two equinoxes

shí'èrfēn

十二分

[十二分]

exceedingly
hundred percent
everything and more

dì'èrchūn

第二春

[第二春]

(lit.) second spring
(fig.) falling in love for the second time
a new lease of life
rebirth

Erdiéjì

二叠纪

[二疊紀]

Permian (geological period 292-250m years ago)

Erlǐtou

二里头

[二里頭]

Erlitou (Xia dynasty 夏朝 ( Xiàcháo) archaeological site at Yanshi 偃師／偃师 ( Yǎnshī) in Luoyang 洛陽／洛阳 ( Luòyáng), Henan)

Ershuǐ Xiāng

二水乡

[二水鄉]

Ershui or Erhshui Township in Changhua County 彰化縣／彰化县 ( Zhānghuà Xiàn), Taiwan

Erdàoqū

二道区

[二道區]

Erdao district of Changchun city 長春市／长春市, Jilin

èrhuángdì

二皇帝

[二皇帝]

second emperor of a dynasty

shí'èrzhī

十二支

[十二支]

the 12 earthly branches 子 (zǐ), 丑, 寅, 卯, 辰, 巳, 午, 未, 申, 酉, 戌, 亥 (used cyclically in the calendar and as ordinal number)

èrchǎnfù

二产妇

[二產婦]

lady who has given birth twice

èrbiànkǔ

二遍苦

[二遍苦]

second persecution

èrgǎzi

二尕子

[二尕子]

scoundrel

èrjiānbàn

二尖瓣

[二尖瓣]

mitral valve (physiology)

èrréntái

二人台

[二人臺]

genre of song-and-dance duet popular in Inner Mongolia

zhōng'èrbìng

中二病

[中二病]

(neologism) strange behavior characteristic of a teenager going through puberty (loanword from Japanese "chūnibyō")

èrrénzhuàn

二人转

[二人轉]

genre of song-and-dance duet popular in northeast China

Xīnxiù'èr

心宿二

[心宿二]

Antares, the brightest star in Scorpio 天蠍座／天蝎座 ( Tiānxiēzuò)

èrjìngōng

二进宫

[二進宮]

name of a famous opera
(slang) to go to jail for a second offense

èrjiǎběn

二甲苯

[二甲苯]

xylene

èrbùzhì

二部制

[二部制]

two shift system (in schools)

èryuánchún

二元醇

[二元醇]

ethyl alcohol C2H5OH

èrmáozi

二毛子

[二毛子]

lit. secondary foreigner
(derogatory term for Chinese Christians and others associated with foreigners, used at the time of the Boxer Rebellion)
(coll.) westernized Chinese person
(derog.) person of mixed Chinese and Russian blood
(slang) Ukraine
German shepherd dog
(dialect) two-year-old goat

Hégǔ'èr

河鼓二

[河鼓二]

Altair (star)

èrfángdōng

二房东

[二房東]

sublandlord
tenant who sublets

èrlèngzi

二愣子

[二愣子]

stupid person
dolt
rash (slang)

èrjiégùn

二节棍

[二節棍]

nunchaku (weapon with two rods joined by a short chain, used in martial arts)

èryuánlùn

二元论

[二元論]

dualism, belief that the universe is made of two different substance (e.g. mind and matter or good and evil)

èrèyīng

二𫫇英

[二噁英]

dioxin

dì'èrgerén

第二个人

[第二個人]

the second person
(fig.) someone else
third party

dàchī'èrhē

大吃二喝

[大吃二喝]

to eat and drink extravagantly
to binge

shí'èrdìzhī

十二地支

[十二地支]

the 12 earthly branches 子 (zǐ), 丑, 寅, 卯, 辰, 巳, 午, 未, 申, 酉, 戌, 亥 (used cyclically in the calendar and as ordinal numbers)

Dì'èr Shìjiè

第二世界

[第二世界]

Second World (Cold War-era term referring to communist nations as a bloc)

Jiǔ Er Gòngshí

九二共识

[九二共識]

1992 Consensus, statement issued after 1992 talks between PRC and Taiwan representatives, asserting that there is only one China

èrfēnyīnfú

二分音符

[二分音符]

minim (music)

èrcìfāngchéng

二次方程

[二次方程]

quadratic equation

èryǎnghuàdàn

二氧化氮

[二氧化氮]

nitrogen dioxide

yīlái'èrqù

一来二去

[一來二去]

gradually
little by little
in the course of time

běn'èrdànzhuó

苯二氮䓬

[苯二氮䓬]

(organic chemistry, pharmacology) benzodiazepine

chúgǎozēng'èr

蒭藁增二

[蒭藁增二]

same as 米拉, Mira (red giant star, Omicron Ceti), variable star with period of 330 days

èrshímiàntǐ

二十面体

[二十面體]

icosahedron

èrhàorénwù

二号人物

[二號人物]

second best person
second-rate person

Ershísì Shǐ

二十四史

[二十四史]

the Twenty-Four Histories (25 or 26 in modern editions), collection of books on Chinese dynastic history from 3000 BC till 17th century
fig. a long and complicated story

dàmá'èrfēn

大麻二酚

[大麻二酚]

cannabidiol (CBD)

èrshíyīdiǎn

二十一点

[二十一點]

blackjack (card game)

èryǎnghuàměng

二氧化锰

[二氧化錳]

manganese(iv) oxide

èryǎnghuàtài

二氧化钛

[二氧化鈦]

titanium dioxide

yīqióng'èrbái

一穷二白

[一窮二白]

impoverished
backward both economically and culturally

dúyīwú'èr

独一无二

[獨一無二]

unique and unmatched (idiom); unrivalled
nothing compares with it

èrlüjiǎwán

二氯甲烷

[二氯甲烷]

dichloromethane

dì'èrjìdù

第二季度

[第二季度]

second quarter (of financial year)

gōng'èrtóujī

肱二头肌

[肱二頭肌]

bicipital muscle
biceps

bù'èrfǎmén

不二法门

[不二法門]

the one and only way
the only proper course to take

èrcìqūxiàn

二次曲线

[二次曲線]

quadratic curve (geometry)
conic

Erdàojiāngqū

二道江区

[二道江區]

Erdaojiang district of Tonghua city 通化市, Jilin

shí'èrzhǐcháng

十二指肠

[十二指腸]

duodenum

èrshíbāxiù

二十八宿

[二十八宿]

the twenty-eight constellations

shí'èrxīngzuò

十二星座

[十二星座]

the twelve signs of the zodiac

èrcìhánshù

二次函数

[二次函數]

quadratic function

èrhàodiànchí

二号电池

[二號電池]

C size battery (Tw)
PRC equivalent: 三號電池／三号电池 (sānhàodiànchí)

èryǎnghuàyóu

二氧化铀

[二氧化鈾]

brown oxidier
uranium dioxide

shí'èrbiānxíng

十二边形

[十二邊形]

dodecagon

èryǎnghuàguī

二氧化硅

[二氧化硅]

silicon dioxide (SiO2)

èrnǎizhuānjiā

二奶专家

[二奶專家]

"mercenary expert", a person who is supposedly an independent expert, but receives payment for making comments favorable to a particular entity

èrjíshìguān

二级士官

[二級士官]

sergeant

èrrénshìjiè

二人世界

[二人世界]

world with only two people (usually refers to a romantic couple)
romantic couple's world

yīgān'èrjìng

一干二净

[一乾二淨]

thoroughly (idiom)
completely
one and all
very clean

lüèzhīyī'èr

略知一二

[略知一二]

to know just a little; to have a rough idea

dì'èrchǎnyè

第二产业

[第二產業]

secondary industry

èrshíshìjì

二十世纪

[二十世紀]

20th century

yīshì'èrfèn

一式二份

[一式二份]

in duplicate

guǎ'èrshǎoshuāng

寡二少双

[寡二少雙]

peerless
second to none (idiom)

èrdàofànzi

二道贩子

[二道販子]

middleman
buyer and seller

chényīzhǔ'èr

臣一主二

[臣一主二]

One has the right to choose the ruler one serves. (ancient proverb)

zhōuxiū'èrrì

周休二日

[週休二日]

(Tw) two-day weekend (usually Saturday and Sunday)

yīxīn'èryòng

一心二用

[一心二用]

to do two things at once (idiom)
to multitask
to divide one's attention

èrbānbǎilíng

二斑百灵

[二斑百靈]

(bird species of China) bimaculated lark (Melanocorypha bimaculata)

èrchóngmǔyīn

二重母音

[二重母音]

diphthong

dì'èrzhíyè

第二职业

[第二職業]

second job

èrliúhuàtàn

二硫化碳

[二硫化碳]

carbon disulfide

shí'èryuèfèn

十二月份

[十二月份]

December

huàyībù'èr

划一不二

[劃一不二]

fixed
unalterable

shí'èrshíchen

十二时辰

[十二時辰]

twelve divisions of the day of early Chinese and Babylonian timekeeping and astronomy

tuìjū'èrxiàn

退居二线

[退居二線]

to withdraw to the second line of duty
to resign from a leading post (and assume an advisory post)

háowú'èrzhì

毫无二致

[毫無二致]

there cannot be another one like it

Ercì Gémìng

二次革命

[二次革命]

Second Revolution, campaign from 1913 of the provisional revolutionary government (under Sun Yat-sen and the Guomindang) against Yuan Shikai 袁世凱／袁世凯 ( Yuán Shìkǎi) and the Northern Warlords

èrcìqūmiàn

二次曲面

[二次曲面]

quadric surface (geometry)

sānshí'èrxiàng

三十二相

[三十二相]

the thirty-two physical characteristics of Buddha

yīshí'èrniǎo

一石二鸟

[一石二鳥]

to kill two birds with one stone (idiom)

èrshíwǔshǐ

二十五史

[二十五史]

twenty four dynastic histories (or 25 or 26 in modern editions)

èryǎnghuàwù

二氧化物

[二氧化物]

dioxide

jiē'èrliánsān

接二连三

[接二連三]

one after another (idiom)
in quick succession

èrbājiārén

二八佳人

[二八佳人]

16-year-old beauty

èrfēnzhīyī

二分之一

[二分之一]

one half

Erlián Péndì

二连盆地

[二連盆地]

Erlian Basin in Inner Mongolia

jià'èrlángtuǐ

架二郎腿

[架二郎腿]

to stick one leg over the other (when sitting)

qiào'èrlángtuǐ

翘二郎腿

[翹二郎腿]

to stick one leg over the other (when sitting)

yīqīng'èrchǔ

一清二楚

[一清二楚]

to be very clear about sth (idiom)

sānxīn'èryì

三心二意

[三心二意]

in two minds about sth (idiom)
half-hearted
shilly-shallying

èrchóngxiàbiāo

二重下标

[二重下標]

double subscript
doubly indexed

gǔ'èrtóujī

股二头肌

[股二頭肌]

biceps femoris (anatomy)

xīnwú'èryòng

心无二用

[心無二用]

one cannot concentrate on two things at the same time

shí'èrjīngmài

十二经脉

[十二經脈]

twelve channels of TCM

èryǎnghuàtàn

二氧化碳

[二氧化碳]

carbon dioxide CO2

èrhuà-bùshuō

二话不说

[二話不說]

(idiom) not saying anything further; not raising any objection; without demur

Ercì Dàzhàn

二次大战

[二次大戰]

World War Two

èrbǎifāngzhēn

二百方针

[二百方針]

see 雙百方針／双百方针 (shuāngbǎifāngzhēn)

zuìxiǎo'èrchéng

最小二乘

[最小二乘]

least squares (math.)

èrhuà-méishuō

二话没说

[二話沒說]

see 二話不說／二话不说 (èrhuà-bushuo)

yìwù'èrxī

异戊二烯

[異戊二烯]

isoprene

èryǎnghuàliú

二氧化硫

[二氧化硫]

sulfur dioxide SO2

èrděnggōngmín

二等公民

[二等公民]

second-class citizen

Erliánhàotè

二连浩特

[二連浩特]

Erenhot City in Xilingol League 錫林郭勒盟／锡林郭勒盟 ( Xīlínguōlè Méng), Inner Mongolia

shǔyīshǔ'èr

数一数二

[數一數二]

(idiom) reckoned to be best or second best; one of the very best
(idiom) to list one by one

èrzhèngbǐngmí

二正丙醚

[二正丙醚]

di-n-propyl ether

èrběnlüshèn

二苯氯胂

[二苯氯胂]

diphenylchloroarsine

shí'èrmiàntǐ

十二面体

[十二面體]

dodecahedron

shuōyībù'èr

说一不二

[說一不二]

to say one and mean just that (idiom); to keep one's word

Yuēhàn'èrshū

约翰二书

[約翰二書]

Second epistle of St John

èryǎngzáqǐ

二氧杂芑

[二氧雜芑]

dioxin

guāng'èrjíguǎn

光二极管

[光二極管]

photodiode
light-emitting diode (LED)

shí'èrjiǎoxíng

十二角形

[十二角形]

dodecagon

Ershísì Xiào

二十四孝

[二十四孝]

the Twenty-four Filial Exemplars, classic Confucian text on filial piety from Yuan dynasty

yīqīng'èrbái

一清二白

[一清二白]

perfectly clean
blameless
unimpeachable (idiom)

Ershíyī Tiáo

二十一条

[二十一條]

the Japanese Twenty-One Demands of 1915

yīfēnwéi'èr

一分为二

[一分為二]

one divides into two
to be two-sided
there are two sides to everything
to see both sb's good points and shortcomings (idiom)

èrcìduōxiàngshì

二次多项式

[二次多項式]

quadratic polynomial

Sìshí'èr Zhāngjīng

四十二章经

[四十二章經]

The Sutra in Forty-two Sections Spoken by the Buddha, the first Chinese Buddhist text, translated in 67 AD by Kasyapa-Matanga 迦葉摩騰／迦叶摩腾 ( Jiāyè Móténg) and Gobharana 竺法蘭／竺法兰 ( Zhúfǎlán) (Dharmaraksha)

sìyī'èrshìbiàn

四一二事变

[四一二事變]

the coup of 12th Mar 1927, an attempt by Chiang Kai-shek to suppress the communists
called 反革命政變／反革命政变 or 慘案／惨案 in PRC literature

èrjiǎjīshēnsuān

二甲基砷酸

[二甲基砷酸]

dimethylarsenic acid (CH3)2AsO2H
cacodylic acid

èrjiānbànxiázhǎi

二尖瓣狭窄

[二尖瓣狹窄]

mitral stenosis (physiology)

shí'èrpíngjūnlü

十二平均律

[十二平均律]

equal temperament

jīguāng'èrjíguǎn

激光二极管

[激光二極管]

laser diode

chánjiā'èrxiānsheng

缠夹二先生

[纏夾二先生]

annoying muddle-headed person who gabbles unintelligibly

huángdàoshí'èrgōng

黄道十二宫

[黃道十二宮]

see 十二宮／十二宫 (shí'èrgōng)

èryītiānzuòwǔ

二一添作五

[二一添作五]

lit. one half equals zero point five (division rule in abacus reckoning)
to share fairly between two parties
to go fifty-fifty

fāguāng'èrjítǐ

发光二极体

[發光二極體]

light-emitting diode (LED) (Tw)

sānshí'èrwèiyuán

三十二位元

[三十二位元]

32-bit (computing)

sìyī'èrcǎn'àn

四一二惨案

[四一二慘案]

the massacre of 12th Mar 1927
the Shanghai coup of 12th Mar 1927 by Chiang Kai-shek against the communists

èrshíyīshìjì

二十一世纪

[二十一世紀]

21st century

guāngdiàn'èrjíguǎn

光电二极管

[光電二極管]

photodiode

sānxiàwǔchú'èr

三下五除二

[三下五除二]

three, set five remove two (abacus rule)
efficiently
quickly and easily

sānqī'èrshíyī

三七二十一

[三七二十一]

three sevens are twenty-one (idiom)
the facts of the matter
the actual situation

niǎogānsuān'èrnà

鸟苷酸二钠

[鳥苷酸二鈉]

disodium guanylate (E627)

Yī'èr Jiǔ Yùndòng

一二九运动

[一二九運動]

December 9th Movement (1935), student-led demonstrations demanding that the Chinese government resist Japanese aggression

yīyǎnghuà'èrdàn

一氧化二氮

[一氧化二氮]

nitrous oxide N2O
laughing gas

yītuìliù'èrwǔ

一退六二五

[一退六二五]

see 一推六二五 (yītuīliù'èrwǔ)

èrliánjùdàolóng

二连巨盗龙

[二連巨盜龍]

Gigantoraptor erlianensis (a giant bird-like dinosaur found in Erlian in Inner Mongolia)

èrlínsuānxiàngān

二磷酸腺苷

[二磷酸腺苷]

adenosine diphosphate (ADP)

wǔyǎnghuà'èrfán

五氧化二钒

[五氧化二釩]

Vanadium pentoxide V2O5
vanadic anhydride

èrxiàngshìxìshù

二项式系数

[二項式係數]

(math.) binomial coefficient

èrshísìjiéqi

二十四节气

[二十四節氣]

the 24 solar terms, calculated from the position of the sun on the ecliptic, that divide the year into 24 equal periods

yītuīliù'èrwǔ

一推六二五

[一推六二五]

1 divided by 16 is 0.0625 (abacus rule)
(fig.) to deny responsibility; to pass the buck

èrjiǎjīshènsuān

二甲基胂酸

[二甲基胂酸]

dimethylarsenic acid (CH3)2AsO2H
cacodylic acid

èrliújībǐngchún

二硫基丙醇

[二硫基丙醇]

dimercaprol

bōlì'èrxiàngxìng

波粒二象性

[波粒二象性]

wave-particle duality in quantum mechanics

Bā Er Sān Pàozhàn

八二三炮战

[八二三炮戰]

bombardment of Kinmen by PRC forces that started August 23rd 1958, also called the Second Taiwan Strait Crisis

Liù Erwǔ Zhànzhēng

六二五战争

[六二五戰爭]

the Korean War (started June 25 1950)

èrjìnzhìbiānmǎ

二进制编码

[二進制編碼]

binary code
binary encoding

Erliánhàotè Shì

二连浩特市

[二連浩特市]

Erenhot City in Xilingol League 錫林郭勒盟／锡林郭勒盟 ( Xīlínguōlè Méng), Inner Mongolia

jīgānsuān'èrnà

肌苷酸二钠

[肌苷酸二鈉]

disodium inosinate (E631)

fāguāng'èrjíguǎn

发光二极管

[發光二極管]

light-emitting diode
LED

liù'èrwǔshìbiàn

六二五事变

[六二五事變]

Korean war (dating from North Korean invasion on 25th Jun 1950)

èrxiàngshìdìnglǐ

二项式定理

[二項式定理]

the binomial theorem (math.)

èrliánshìfāpiào

二联式发票

[二聯式發票]

(Tw) duplicate uniform invoice, a type of receipt 統一發票／统一发票 (tǒngyīfāpiào) issued to a person or organization without a VAT identification number

Yī Erbā Shìbiàn

一二八事变

[一二八事變]

Shanghai Incident of 28th January 1932, Chinese uprising against Japanese quarters of Shanghai

yīdìsuān'èrgǔ

依地酸二钴

[依地酸二鈷]

kelocyanor

Erkè Pāi'àn Jīngqí

二刻拍案惊奇

[二刻拍案驚奇]

Slapping the Table in Amazement (Part II), second of two books of vernacular stories by Ming dynasty novelist Ling Mengchu 凌濛初／凌蒙初 ( Líng Méngchū)

yīshānbùróng'èrhǔ

一山不容二虎

[一山不容二虎]

lit. the mountain can't have two tigers (idiom)
fig. this town ain't big enough for the two of us
(of two rivals) to be fiercely competitive

Ercì Shìjiè Dàzhàn

二次世界大战

[二次世界大戰]

World War Two

jiǔniú'èrhǔzhīlì

九牛二虎之力

[九牛二虎之力]

tremendous strength (idiom)

yīhuíshēng'èrhuíshú

一回生二回熟

[一回生二回熟]

unfamiliar at first, but well accustomed soon enough (idiom)

dì'èrxíngtángniàobìng

第二型糖尿病

[第二型糖尿病]

Type 2 diabetes

èrjítóuhūxīqì

二级头呼吸器

[二級頭呼吸器]

(scuba diving) regulator; demand valve

èryǎnghuàtàngélí

二氧化碳隔离

[二氧化碳隔離]

carbon sequestration
carbon dioxide sequestration

línběn'èrjiǎsuānzhǐ

邻苯二甲酸酯

[鄰苯二甲酸酯]

phthalate (chemistry)

tiāndōngběnbǐng'èrtàizhǐ

天冬苯丙二肽酯

[天冬苯丙二肽酯]

aspartame C14H18N2O (artificial sweetener)

Dì'èr Cì Shìjiè Dàzhàn

第二次世界大战

[第二次世界大戰]

World War II

yīkū'èrnàosānshàngdiào

一哭二闹三上吊

[一哭二鬧三上吊]

(idiom) to make a terrible scene; to throw a tantrum

guǎntāsānqī'èrshíyī

管他三七二十一

[管他三七二十一]

who cares
no matter what
regardless of the consequences

èrliújīhǔpòsuānnà

二硫基琥珀酸钠

[二硫基琥珀酸鈉]

sodium dimercaptosuccinate

èrliújībǐnghuángsuānnà

二硫基丙磺酸钠

[二硫基丙磺酸鈉]

sodium dimercaptosulfanate

yībùzuò,èrbùxiū

一不做，二不休

[一不做，二不休]

lit. either don't do it, or don't rest (idiom)
fig. if you do it at all, you may as well go the whole hog
in for a penny, in for a pound

qié'èrshíbāxīngpiáochóng

茄二十八星瓢虫

[茄二十八星瓢蟲]

28-spotted ladybird
hadda beetle
Henosepilachna vigintioctopunctata

bùguǎnsānqī'èrshíyī

不管三七二十一

[不管三七二十一]

regardless of the consequences
recklessly relying on a hopelessly optimistic forecast

yīshìyī,èrshì'èr

一是一，二是二

[一是一，二是二]

lit. one is one, two is two (idiom)
fig. things are (or ought to be) perfectly clear-cut
unequivocal

Shànghǎi Dì'èr Yīkē Dàxué

上海第二医科大学

[上海第二醫科大學]

Shanghai Second Medical University

sìyī'èrfǎngémìngzhèngbiàn

四一二反革命政变

[四一二反革命政變]

counterrevolutionary coup of 12th April 1927, Chiang Kai-shek's coup against the communists in Shanghai

Huánghuāgāngqīshí'èrlièshì

黄花岗七十二烈士

[黃花崗七十二烈士]

the seventy two martyrs of the Huanghuagang uprising of 23rd April 1911

èrlüběn'ànběnyǐsuānnà

二氯苯胺苯乙酸钠

[二氯苯胺苯乙酸鈉]

diclofenac sodium (non-steroidal anti-inflammatory drug used to reduce swelling and as painkiller)
also called voltaren 扶他林

èrlüyìsānjùqíngsuānnà

二氯异三聚氰酸钠

[二氯異三聚氰酸鈉]

sodium dichloroisocyanurate

bèiyòng'èrjítóuhūxīqì

备用二级头呼吸器

[備用二級頭呼吸器]

(scuba diving) backup regulator; octopus

Ershí Nián Mùdǔzhī Guài Xiànzhuàng

二十年目睹之怪现状

[二十年目睹之怪現狀]

The Strange State of the World Witnessed Over 20 Years, novel by late Qing novelist Wu Jianren 吳趼人／吴趼人 ( Wú Jiǎnrén)

Dì'èrcì Hànzì Jiǎnhuà Fāng'àn

第二次汉字简化方案

[第二次漢字簡化方案]

Second Chinese Character Simplification Scheme (second round of simplified Chinese characters, proposed in 1977 and retracted in 1986)
abbr. to 二簡／二简 (èrjiǎn)

yǒuyīshuōyī,yǒu'èrshuō'èr

有一说一，有二说二

[有一說一，有二說二]