wise-ass : 自作聪明的。 pain in the neck : 讨厌的人（或事物）。
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N a person who thinks he or she is being witty or clever 自以为聪明的人
N (as modifier) 自以为聪明的
some wiseass kid at the back of the class
Nobody likes a wise ass so keep your rude comments to yourself.
没人喜欢狂妄自大的人，把你粗鲁的评论留给自己听吧。
youdao
The ass waggeth his ears. This proverb is applied to those who lack learning, and yet talk as if they were very wise;
这个成语用于那些不学无术，可又似乎说起话来头头是道的人。 自作聪明。
My favorite traveling foodie, DIY kitchen guru, and curmudgeonly wise-ass, Mark Bittman, is ending his popular column, The Minimalist.
FORBES: NY Times Minimalist Column Ends, Bittman Branches Out
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