smart alec
noun [ C ] informal (US smart aleck, smart-aleck) uk/ˌsmɑːt ˈæl.ɪk/ us/ˌsmɑːrt ˈæl.ɪk/
自作聪明的人,自以为是的人
someone who tries to appear clever or who answers questions in a clever way that annoys other people
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