双键

Traditional form:

雙鍵

Pinyin (reading):

shuāngjiàn

Definitions:

• double bond (chemistry)

Characters:

• 双 - pair, couple; both; measure word for things that come in pairs
• 键 - lock, door bolt; key

Traditional characters:

• 雙 - pair, couple; both; measure word for things that come in pairs
• 鍵 - lock, door bolt; key