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对

ㄉㄨㄟ ˋ

duì

correct

乙

ㄧ ˇ

yǐ

second

酰

ㄒㄧㄢ

xiān

acid radical

氨

ㄢ

ān

ammonia

基

ㄐㄧ

jī

base

酚

ㄈㄣ

fēn

phenol