diamond in the rough
noun [ C usually singular ] US uk/ˌdaɪə.mənd ɪn ðə ˈrʌf/ us/ˌdaɪə.mənd ɪn ðə ˈrʌf/ (UK rough diamond)
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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