rough diamond
noun [ C ] UK uk/ˌrʌf ˈdaɪə.mənd/ us/ˌrʌf ˈdaɪə.mənd/ (US diamond in the rough)
看上去粗鲁但心地善良的人,外粗内秀的人
a person who is kinder and more pleasant than they seem to be from their appearance and manner
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