Usage of the character 空

(of a ship, train etc) not carrying any load (i.e. no passengers or freight etc)
(electricity) no-load (used to describe the condition of a transformer when there is no load connected to its secondary coil)

shēngkōng

升空

[升空]

to rise to the sky
to lift off
to levitate
liftoff

kōngnù

空怒

[空怒]

air rage

liúkòng

留空

[留空]

to leave blank space in a document
to leave some time free

tāokōng

掏空

[掏空]

to hollow out
to empty out
to use up
(finance) tunneling

fàngkōng

放空

[放空]

to relax completely
to empty one's mind
(finance) to sell short
(of a commercial vehicle) to travel empty (no cargo or passengers)
to deadhead

shíkōng

时空

[時空]

time and place
world of a particular locale and era
(physics) space-time

kōngxiǎng

空想

[空想]

daydream
fantasy
to fantasize

kōnggǎng

空港

[空港]

airport (abbr. for 航空港 (hángkōnggǎng))

kōnghào

空号

[空號]

disconnected phone number
unassigned phone number

lúnkōng

轮空

[輪空]

(sports) bye; to get a bye
(of an employee) to be not scheduled at work for a period of time (when working shifts)

fēikōng

非空

[非空]

nonempty (set)

kōngdòng

空洞

[空洞]

cavity
empty
vacuous

kōngtiáo

空调

[空調]

air conditioning
air conditioner (including units that have a heating mode)
CL:臺／台 (tái)

kōngxí

空袭

[空襲]

to make an air raid

kòngbái

空白

[空白]

blank space

màikōng

卖空

[賣空]

to sell short (finance)

kōngshǒu

空手

[空手]

empty-handed
unarmed
(painting, embroidery etc) without following a model
(abbr. for 空手道 (kōngshǒudào)) karate

kòngxián

空闲

[空閒]

leisure; spare time
(of a person) free; unoccupied
(of equipment, rooms etc) unoccupied; unused; idle; vacant; spare

kōngqù

空阒

[空闃]

empty and quiet

yèkōng

夜空

[夜空]

night sky

fángkōng

防空

[防空]

anti-aircraft defense

Kōngkè

空客

[空客]

Airbus (abbr. for 空中客車／空中客车 ( Kōngzhōng Kèchē))

hángkōng

航空

[航空]

aviation

zhōngkōng

中空

[中空]

hollow
empty interior

kōngjiān

空间

[空間]

space; room
(fig.) scope; leeway
(astronomy) outer space
(physics, math.) space

kōngzhú

空竹

[空竹]

Chinese yo-yo

kōngfù

空腹

[空腹]

an empty stomach

kòngrì

空日

[空日]

day that is named but not numbered (on ethnic calendar)

kōngkuàng

空旷

[空曠]

spacious and empty
void

tōukòng

偷空

[偷空]

to take some time out
to make use of a spare moment

kōngjí

空集

[空集]

empty set (set theory)

kōngtóu

空头

[空頭]

phony
so-called
armchair (expert)
vain (promise)
(finance) short-seller
bear (market)
short (selling)

kōngpāi

空拍

[空拍]

aerial photography (video or still) (Tw)

kōnghuàn

空幻

[空幻]

vanity
empty fantasy
illusion

kōngzhong

空钟

[空鐘]

diabolo (Chinese yo-yo)

tàikōng

太空

[太空]

outer space

làokōng

落空

[落空]

to fail to achieve something; to be fruitless

kōngzhì

空置

[空置]

to set sth aside
to let sth lie idle
idle
unused

lòukōng

镂空

[鏤空]

openwork
fretwork

píngkōng

凭空

[憑空]

baseless (lie)
without foundation

Wù Kōng

悟空

[悟空]

Sun Wukong, the Monkey King, character with supernatural powers from the novel Journey to the West 西遊記／西游记 ( Xī Yóu Jì)

kōngtóu

空投

[空投]

to airdrop

kòngdàng

空档

[空檔]

gap (between two objects)
interval of time (between events)
opening in one's schedule
free time
(fig.) gap (in the market etc)

kōngnàn

空难

[空難]

air crash
aviation accident or incident

héngkōng

横空

[橫空]

filling the atmosphere
covering the sky

kòngdì

空地

[空地]

vacant land
open space

kòngzi

空子

[空子]

gap
unoccupied space or time
fig. gap
loophole

kōngshēn

空身

[空身]

empty handed (carrying nothing)
alone

kòng'é

空额

[空額]

vacancy
unfilled work place

kōngxìng

空性

[空性]

emptiness

kōngzhí

空值

[空值]

null value (in a relational database)

kōngqì

空气

[空氣]

air
atmosphere

shàngkōng

上空

[上空]

the skies above a certain place; (aviation) airspace
(Tw) topless

xūkōng

虚空

[虛空]

void
hollow
empty

chángkōng

长空

[長空]

(literary) the vast sky
(finance) eventual downturn
poor prospects in the long term

lǐngkōng

领空

[領空]

territorial air space

téngkōng

腾空

[騰空]

to soar
to rise high into the air

bōkòng

拨空

[撥空]

to make time

kōngzhōng

空中

[空中]

in the sky
in the air

xuánkōng

悬空

[懸空]

to hang in the air
suspended in midair
(fig.) uncertain

kōngwèi

空位

[空位]

empty place
room (for sb)

qīngkōng

清空

[清空]

to clear
to empty

kōngjūn

空军

[空軍]

air force

kōngcháng

空肠

[空腸]

jejunum (empty gut, middle segment of small intestine between duodenum 十二指腸／十二指肠 (shí'èrzhǐcháng) and ileum 回腸／回肠 (huícháng))

kōngtán

空谈

[空談]

prattle
idle chit-chat

kōng'ěr

空耳

[空耳]

to intentionally reinterpret a spoken expression as if one had misheard it, for the sake of humor (often, it is a phrase in a foreign language twisted into a similar-sounding phrase in one's native language with a completely different meaning) (orthographic borrowing from Japanese 空耳 "soramimi")

tuōkōng

脱空

[脫空]

to fail
to come to nothing
to fall through (of plans, hopes)
to lie

làkòng

落空

[落空]

to omit; to neglect (to do sth)
to miss a chance; to let an opportunity slip by

kōngdì

空地

[空地]

air-to-surface (missile)

jiàkōng

架空

[架空]

to build (a hut etc) on stilts
to install (power lines etc) overhead
(fig.) unfounded; impractical
(fig.) to make sb a mere figurehead

kōngcháo

空巢

[空巢]

empty nest
a home where the kids have grown up and moved out

kòngr

空儿

[空兒]

spare time
free time

yǒukòng

有空

[有空]

to have time (to do sth)

kōngzhàn

空战

[空戰]

air war
air warfare

duǎnkōng

短空

[短空]

poor prospects in the short term (finance)

kōngfān

空翻

[空翻]

flip
somersault

kōngyùn

空运

[空運]

air transport

dāngkōng

当空

[當空]

overhead
up in the sky

kōngjiě

空姐

[空姐]

abbr. for 空中小姐
stewardess
air hostess
female flight attendant

bànkōng

半空

[半空]

midair

kòngdāng

空当

[空當]

gap
interval

kòngxué

空穴

[空穴]

electron hole (physics)

kòngxīn

空心

[空心]

on an empty stomach

kōngdǎng

空挡

[空擋]

neutral gear

záokōng

凿空

[鑿空]

to open an aperture
(extended meaning) to cut a way through
to open up a road

zhēnkōng

真空

[真空]

vacuum

kōngfáng

空防

[空防]

air force
air defense

gāokōng

高空

[高空]

high altitude

tàkōng

踏空

[踏空]

to miss one's step
(of an investor) to fail to invest before the price rises

pūkōng

扑空

[撲空]

lit. to rush at thin air
fig. to miss one's aim
to have nothing to show for one's troubles

kòngkuì

空匮

[空匱]

scarce
poor

cǎikōng

踩空

[踩空]

to miss one's step

tàikōngrén

太空人

[太空人]

astronaut

tàikōngsuō

太空梭

[太空梭]

space shuttle

kōngjiānjú

空间局

[空間局]

space agency

qiánkōngfān

前空翻

[前空翻]

(acrobatics) front flip

zǐkōngjiān

子空间

[子空間]

subspace (math.)

fàngkōngpào

放空炮

[放空炮]

(lit.) to fire blank shots
(fig.) to be all talk and no action
to shoot one's mouth off
to make empty promises

kōngxīnqiú

空心球

[空心球]

hollow ball
(basketball) swish shot

fàngkōngdǎng

放空挡

[放空擋]

to coast along in neutral gear (in a car)
(coll.) to go commando

kōngjiàngbīng

空降兵

[空降兵]

paratroopers

tuōkōnghàn

脱空汉

[脫空漢]

liar

kōngpāijī

空拍机

[空拍機]

drone equipped for aerial photography

Sūn Wùkōng

孙悟空

[孫悟空]

Sun Wukong, the Monkey King, character with supernatural powers in the novel Journey to the West 西遊記／西游记 ( Xīyóu Jì)
Son Goku, the main character in Dragon Ball 七龍珠／七龙珠 ( Qīlóngzhū)

kònggéjiàn

空格键

[空格鍵]

space bar (keyboard)

kōngluòluò

空落落

[空落落]

empty
desolate

tàikōngzhàn

太空站

[太空站]

space station

tàikōngyóu

太空游

[太空遊]

space tourism

kōngduìdì

空对地

[空對地]

air-to-surface (missile)

tàikōngfú

太空服

[太空服]

spacesuit

kòngbáidiǎn

空白点

[空白點]

gap
empty space

kōngxīncài

空心菜

[空心菜]

see 蕹菜 (wèngcài)

fǎnkōngjiàng

反空降

[反空降]

anti-aircraft defense

kōngzheshǒu

空着手

[空著手]

empty-handed

tàikōngbù

太空步

[太空步]

moonwalk (dance)

bànkōngzhōng

半空中

[半空中]

in midair
in the air

wàitàikōng

外太空

[外太空]

outer space

zhìkōngquán

制空权

[制空權]

air supremacy; air superiority

yǒukòngr

有空儿

[有空兒]

erhua variant of 有空／有空 (yǒukòng)

fángkōngdòng

防空洞

[防空洞]

air-raid shelter

hángkōngshù

航空术

[航空術]

aeronautics

kōngxiǎngjiā

空想家

[空想家]

impractical dreamer

méikòngr

没空儿

[沒空兒]

having no time

hángkōnggǎng

航空港

[航空港]

airfield
aerodrome

tàikōngchuán

太空船

[太空船]

spaceship

hángkōngyè

航空业

[航空業]

aviation industry

cèkōngfān

侧空翻

[側空翻]

aerial cartwheel
side somersault

kōngdòngdòng

空洞洞

[空洞洞]

empty
deserted

gāokōngbìng

高空病

[高空病]

high altitude sickness

kōngshǒudào

空手道

[空手道]

karate

chuǎngkōngmén

闯空门

[闖空門]

to break into a house when nobody is home

kōngfúyuán

空服员

[空服員]

flight attendant
cabin crew

kōngfángjiān

空房间

[空房間]

vacant room

kōngchuāngqī

空窗期

[空窗期]

window period (time between infection and the appearance of detectable antibodies)
period during which sth is lacking (boyfriend or girlfriend, work, revenue, production of a commodity etc)
lull
hiatus

zhēnkōngbèng

真空泵

[真空泵]

vacuum pump

zuānkòngzi

钻空子

[鑽空子]

to take advantage of a loophole; to exploit an advantage; to seize the opportunity (esp. to do sth bad)

hángkōngqì

航空器

[航空器]

aircraft

chīkòng'é

吃空额

[吃空額]

to embezzle by adding to the payroll employees existing in name only

jiǎdàkōng

假大空

[假大空]

empty words
bogus speech

guàkōngdǎng

挂空挡

[掛空擋]

see 放空擋／放空挡 (fàngkōngdǎng)

hángkōngxìn

航空信

[航空信]

airmail letter

tàikōngcāng

太空舱

[太空艙]

space capsule
ejection capsule (cabin)

zhēnkōngguǎn

真空管

[真空管]

vacuum tube

xiàngkōngjiān

相空间

[相空間]

phase space (math., ordinary differential equations)

chīkòngxiǎng

吃空饷

[吃空餉]

to embezzle by adding to the payroll employees existing in name only

hángkōngjú

航空局

[航空局]

aviation agency

kōngdàngdàng

空荡荡

[空蕩蕩]

empty; deserted

kōngyùnfèi

空运费

[空運費]

air freight (cost of air transport)

kōngchéngjì

空城计

[空城計]

the empty city stratagem (in which Zhuge Liang presents himself as unperturbed while making it evident that his city is undefended, hoping his adversary will suspect an ambush); double bluff

kōngxīnqiáng

空心墙

[空心牆]

cavity wall
hollow wall

hángkōngzhàn

航空站

[航空站]

air terminal

yīchángkōng

一场空

[一場空]

all in vain; futile

qiēkōngjiān

切空间

[切空間]

space of sections (math.)

kōngxīnmiàn

空心面

[空心麵]

macaroni

hǎikōngjūn

海空军

[海空軍]

navy and air force

Xuánkōng Sì

悬空寺

[懸空寺]

Xuankong Temple or Suspended Temple near Yanyuan in Shanxi

kòngxīnr

空心儿

[空心兒]

erhua variant of 空心 (kòngxīn)

shǒukōngfáng

守空房

[守空房]

to stay home alone (of married woman)

hángkōngxué

航空学

[航空學]

aviation science

kōngjiānzhàn

空间站

[空間站]

space station

Quán Rìkōng

全日空

[全日空]

All Nippon Airways (ANA)

kōngtiáochē

空调车

[空調車]

air conditioned vehicle

hángkōngxiàn

航空线

[航空線]

air route
airway

kōngqìliú

空气流

[空氣流]

flow of air
draft

hòukōngfān

后空翻

[後空翻]

backward somersault
backflip

hǎilùkòng

海陆空

[海陸空]

sea land air (transport, or military operations)

mùkōngsìhǎi

目空四海

[目空四海]

the eye can see nothing worthwhile all around (idiom); arrogant
condescending
supercilious

Hányà Hángkōng

韩亚航空

[韓亞航空]

Asiana Airlines, South Korean airline

shàngshēngkōngjiān

上升空间

[上升空間]

upside
potential to rise

shàngkōngxǐchē

上空洗车

[上空洗車]

topless car wash

duìkōnghuǒqì

对空火器

[對空火器]

anti-aircraft gun

kōngzhōngpiāofú

空中飘浮

[空中飄浮]

to float in the air

tàikōngwǔbù

太空舞步

[太空舞步]

moonwalk (dance)

kōngkōngdǎodàn

空空导弹

[空空導彈]

air-to-air missile

rǔbáitiānkōng

乳白天空

[乳白天空]

whiteout

xiàngliàngkōngjiān

向量空间

[向量空間]

(math.) vector space; linear space

kōngshǒu'érguī

空手而归

[空手而歸]

to return empty-handed
to fail to win anything

yīzhǐkōngwén

一纸空文

[一紙空文]

a worthless piece of paper (idiom)

hángkōngmǔjiàn

航空母舰

[航空母艦]

aircraft carrier (CL:艘 (sōu))
(coll.) (metaphor for sth huge, whale-like)

Akōngjiāguā

阿空加瓜

[阿空加瓜]

Cerro Aconcagua, mountain in the Americas

qíngkōngwànlǐ

晴空万里

[晴空萬里]

a clear and boundless sky

zhōngyāngkōngtiáo

中央空调

[中央空調]

central air conditioning
(fig.) (neologism) ladies' man (contrasted with 暖男 (nuǎnnán), a guy who is attentive to his partner rather than to all and sundry)

jiàkōngsuǒdào

架空索道

[架空索道]

aerial ropeway
cable car

kōngqìwūrǎn

空气污染

[空氣污染]

air pollution

mǎikōngmàikōng

买空卖空

[買空賣空]

to speculate
to play the market
(fig.) to sell hot air
to swindle people by posing as a reputable operator

Fǎguó Hángkōng

法国航空

[法國航空]

Air France

kōngzhōngshàoye

空中少爷

[空中少爺]

airline steward

xiànxìngkōngjiān

线性空间

[線性空間]

(math.) vector space; linear space

tuòpūkōngjiān

拓扑空间

[拓撲空間]

(math.) topological space

Chángróng Hángkōng

长荣航空

[長榮航空]

EVA Air, Taiwanese international airline

kōngkǒuwúpíng

空口无凭

[空口無憑]

mere verbal statement cannot be taken as proof (idiom)

kōngpǎoyītàng

空跑一趟

[空跑一趟]

to make a journey for nothing

kōngtóuzhīpiào

空头支票

[空頭支票]

bounced check; bad check
(fig.) empty promise

gāowéikōngjiān

高维空间

[高維空間]

(math.) higher dimensional space

kōngfùgāoxīn

空腹高心

[空腹高心]

ambitious despite a lack of talent (idiom)

gāokōngzuòyè

高空作业

[高空作業]

to work high above the ground

yǔyìkōngjiān

语义空间

[語義空間]

semantic space

kōngzhōnglóugé

空中楼阁

[空中樓閣]

pavilion in the air (idiom); unrealistic Utopian construction
castles in Spain
imaginary future plans

shèngkuàngkōngqián

盛况空前

[盛況空前]

a magnificent and unprecedented event (idiom)

kōngxuéláifēng

空穴来风

[空穴來風]

lit. wind from an empty cave (idiom)
fig. unfounded (story)
baseless (claim)

réncáiliǎngkōng

人财两空

[人財兩空]

(idiom) to suffer the departure of sb (talented staff or one's spouse etc) and a financial loss as well; to get burned both romantically and financially

kōngtóushìchǎng

空头市场

[空頭市場]

bear market

kōngzhōngjiēlì

空中接力

[空中接力]

alley-oop (basketball)

kōngqìqǔyàng

空气取样

[空氣取樣]

air sampling

Nàkōngshāwàng

那空沙旺

[那空沙旺]

Paknampho city, Thailand

lùhǎikōngjūn

陆海空军

[陸海空軍]

army, navy and air force

wàicéngkōngjiān

外层空间

[外層空間]

outer space

Kōngzhōng Kèchē

空中客车

[空中客車]

Airbus (aerospace company)

duìchènkōngjiān

对称空间

[對稱空間]

symmetric space (math.)

Guótài Hángkōng

国泰航空

[國泰航空]

Cathay Pacific, Hong Kong-based airline

kōngqìjìliàng

空气剂量

[空氣劑量]

air dose

duìkōngshèjī

对空射击

[對空射擊]

anti-aircraft fire
to shoot at enemy planes

kōngkōngdàngdàng

空空荡荡

[空空蕩蕩]

absolutely empty (space)
complete vacuum

wánxíngtiánkòng

完型填空

[完型填空]

cloze (pedagogy)

kōngqìtiáojié

空气调节

[空氣調節]

air conditioning

Dàhán Hángkōng

大韩航空

[大韓航空]

Korean Air, South Korea's main airline

kōnggǔzúyīn

空谷足音

[空谷足音]

lit. the sound of footsteps in a deserted valley (idiom)
fig. sth hard to come by; sth wonderful and rare

Kōngjūn Yīhào

空军一号

[空軍一號]

Air Force One, US presidential jet

tàikōngtànsuǒ

太空探索

[太空探索]

space exploration

wánxíngtiánkòng

完形填空

[完形填空]

cloze (pedagogy)

mùkōngyīqiè

目空一切

[目空一切]

the eye can see nothing worthwhile all around (idiom); arrogant
condescending
supercilious

sìwéikōngjiān

四维空间

[四維空間]

four-dimensional space (math.)

kōngjiāntàncè

空间探测

[空間探測]

space exploration

kōngzhōnggédòu

空中格斗

[空中格鬥]

dogfight (of planes)

wèixíngkōngjiān

位形空间

[位形空間]

configuration space (math.)

kōngdìdǎodàn

空地导弹

[空地導彈]

air-to-surface missile

kōngzhōngpàojiàn

空中炮舰

[空中砲艦]

gunship (aircraft)

kōngxīnluóbo

空心萝卜

[空心蘿蔔]

useless person

kōngqìliútōng

空气流通

[空氣流通]

ventilation; air circulation

kōngqìzháguō

空气炸锅

[空氣炸鍋]

air fryer

dīkōngfēiguò

低空飞过

[低空飛過]

to just scrape through with a narrow pass (in an exam)

héngkōngchūshì

横空出世

[橫空出世]

(idiom) to come to the fore in spectacular fashion; to emerge from obscurity to achieve great success

Límànkōngjiān

黎曼空间

[黎曼空間]

Riemannian space (physics)

kōngzhōngjiéchí

空中劫持

[空中劫持]

to hijack (a plane)
aircraft hijacking
skyjacking

chìshǒukōngquán

赤手空拳

[赤手空拳]

empty hand, empty fist (idiom); having nothing to rely on
unarmed and defenseless

gāokōngtántiào

高空弹跳

[高空彈跳]

bungee jumping (Tw)

sìdàjiēkōng

四大皆空

[四大皆空]

lit. the four elements are vanity (idiom)
this world is an illusion

shíkōngjiāonáng

时空胶囊

[時空膠囊]

time capsule (Tw)

shíkōngchuānyuè

时空穿越

[時空穿越]

time travel

zhèngquánzhēnkōng

政权真空

[政權真空]

power vacuum
political vacuum

kōngkōngdàngdàng

空空荡荡

[空空盪盪]

deserted

hángkōnggōngsī

航空公司

[航空公司]

airline
CL:家 (jiā)

yīsǎo'érkōng

一扫而空

[一掃而空]

to sweep clean
to clean out

hángkōngyùndān

航空运单

[航空運單]

Air Waybill (AWB)

kōngwúsuǒyǒu

空无所有

[空無所有]

having nothing (idiom); utterly destitute
without two sticks to rub together

pīkōngbānhài

劈空扳害

[劈空扳害]

damaged by groundless slander (idiom)

fānkōngchūqí

翻空出奇

[翻空出奇]

to overturn empty convention, and display originality (idiom); new and different ideas

kōngjūnsīlìng

空军司令

[空軍司令]

air commodore
top commander of air force

Gǎnglóng Hángkōng

港龙航空

[港龍航空]

Hong Kong Dragon Airlines (operating as Dragonair), Hong Kong-based international airline

kōngshìqīngyě

空室清野

[空室清野]

empty room, clean field (idiom); clean out everything to leave nothing for the enemy
scorched earth policy

zhēngfākōngtiáo

蒸发空调

[蒸發空調]

evaporative air conditioner
evaporative cooler

kōngkōngdòngdòng

空空洞洞

[空空洞洞]

empty
hollow
lacking in substance

fǎngshèkōngjiān

仿射空间

[仿射空間]

(math.) affine space

xīwàngluòkōng

希望落空

[希望落空]

hopes are dashed

dúshǒukōngfáng

独守空房

[獨守空房]

(of a married woman) to stay home alone

diànzǐkōngjiān

电子空间

[電子空間]

cyberspace

rénqùlóukōng

人去楼空

[人去樓空]

lit. the occupants have gone and the place is now empty (idiom)
fig. (of a dwelling) empty; deserted

wānqūkōngjiān

弯曲空间

[彎曲空間]

curved space

jiàkōnglìshǐ

架空历史

[架空歷史]

alternate history; counterfactual history (genre of fiction)

kōngkégōngsī

空壳公司

[空殼公司]

shell company; shell corporation

sìkuìnángkōng

笥匮囊空

[笥匱囊空]

extremely destitute (idiom)

Měiguó Hángkōng

美国航空

[美國航空]

American Airlines

tiānmǎxíngkōng

天马行空

[天馬行空]

like a heavenly steed, soaring across the skies (idiom)
(of writing, calligraphy etc) bold and imaginative
unconstrained in style

shíkōngchuānsuō

时空穿梭

[時空穿梭]

time travel

kōngjūnjīdì

空军基地

[空軍基地]

air base

hángkōngyóujiǎn

航空邮简

[航空郵簡]

aerogram

kōngqìdònglì

空气动力

[空氣動力]

aerodynamic force

shíkōnglüxíng

时空旅行

[時空旅行]

time travel

dīkōngtiàosǎn

低空跳伞

[低空跳傘]

BASE Jumping

shíkōngcuòzhì

时空错置

[時空錯置]

having elements from another time or place

kōngxīnlǎodà

空心老大

[空心老大]

pretentious and vacuous person

píngxíngshíkōng

平行时空

[平行時空]

parallel universe

sānwéikōngjiān

三维空间

[三維空間]

three-dimensional space
3D

kōngdòngwúwù

空洞无物

[空洞無物]

empty cave, nothing there (idiom); devoid of substance
nothing new to show

tàikōngfēichuán

太空飞船

[太空飛船]

spaceship
spacecraft

kōngzhōngfēirén

空中飞人

[空中飛人]

trapeze artist
frequent flyer

kōngzhōngxiǎojiě

空中小姐

[空中小姐]

stewardess
air hostess

hángkōngshìyè

航空事业

[航空事業]

aviation industry

kòngbáizhīpiào

空白支票

[空白支票]

blank check

yīngjīchángkōng

鹰击长空

[鷹擊長空]

the eagle soars in the sky (citation from Mao Zedong)

tàikōngxíngzǒu

太空行走

[太空行走]

spacewalk

liǎngshǒukōngkōng

两手空空

[兩手空空]

empty-handed (idiom); fig. not receiving anything

hángkōngyóujiàn

航空邮件

[航空郵件]

airmail

kōngqiánjuéhòu

空前绝后

[空前絕後]

unprecedented and never to be duplicated
the first and the last
unmatched
unique

kōngzhōngfēnliè

空中分列

[空中分列]

(military) flyover

wǎngluòkōngjiān

网络空间

[網絡空間]

cyberspace

chāowéikōngjiān

超维空间

[超維空間]

hyperspace
superspace
higher dimensional space

chuānyuèshíkōng

穿越时空

[穿越時空]

to travel through time

chàngkōngchéngjì

唱空城计

[唱空城計]

lit. to sing "The Empty City Stratagem" (idiom)
fig. to put up a bluff to conceal one's weakness
(jocular) (of a place etc) to be empty; (of one's stomach) to be rumbling

kōngqìzǔlì

空气阻力

[空氣阻力]

atmospheric drag

píngkōngniēzào

凭空捏造

[憑空捏造]

fabrication relying on nothing (idiom); frame-up

tàikōngmànbù

太空漫步

[太空漫步]

space walk

hǎikuòtiānkōng

海阔天空

[海闊天空]

wide sea and sky (idiom); boundless open vistas
the whole wide world
chatting about everything under the sun

cānliàngkōngjiān

参量空间

[參量空間]

moduli space (math.)
parameter space

kōngkǒubáihuà

空口白话

[空口白話]

empty promises

kōngkōngrúyě

空空如也

[空空如也]

as empty as anything (idiom); completely bereft
to have nothing
vacuous
hollow
empty (argument, head etc)

sòngshàngtàikōng

送上太空

[送上太空]

to launch into space

zhōngkōngbōli

中空玻璃

[中空玻璃]

double glazing

dùnrùkōngmén

遁入空门

[遁入空門]

to take refuge in religious life

Tàikōng Fēichuán

太空飞船

[太空飛船]

Space Shuttle, US spacecraft system (1981-2011)

sīkōngjiànguàn

司空见惯

[司空見慣]

a common occurrence (idiom)

xǐjiéyīkōng

洗劫一空

[洗劫一空]

to steal everything

kōngzhōnghuāyuán

空中花园

[空中花園]

hanging gardens (Babylon etc)
rooftop garden

kōngwúyīrén

空无一人

[空無一人]

not a soul in sight (idiom)

Rìběn Hángkōng

日本航空

[日本航空]

Japan Airlines (JAL)

miàoshǒukōngkōng

妙手空空

[妙手空空]

petty thief (lit. quick fingered and vanish)
empty-handed
having nothing

kōnghuàliánpiān

空话连篇

[空話連篇]

long-winded empty talk

gékōnghǎnhuà

隔空喊话

[隔空喊話]

to converse with sb by shouting from some distance away
(fig.) to say sth intended for the ears of sb who is not in one's presence (often, by making a public statement or by posting online)

wākōngxīnsi

挖空心思

[挖空心思]