goody two shoes
US /ˈɡʊd.i ˈtuː ˌʃuːz/
UK /ˈɡʊd.i ˈtuː ˌʃuːz/
1.
假正经, 循规蹈矩的人
a person who is excessively virtuous, obedient, and well-behaved, often to the point of being annoying or smug
:
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She's such a goody two shoes, always following the rules and never having any fun.
她真是个假正经，总是循规蹈矩，从不找乐子。
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He was teased for being a goody two shoes because he always finished his homework on time.
他因为总是按时完成作业而被嘲笑为假正经。