goody two shoes
US /ˈɡʊd.i ˈtuː ˌʃuːz/
UK /ˈɡʊd.i ˈtuː ˌʃuːz/

1.
假正經, 循規蹈矩的人
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.
她真是個假正經,總是循規蹈矩,從不找樂子。
•
He was teased for being a goody two shoes because he always finished his homework on time.
他因為總是按時完成作業而被嘲笑為假正經。