no-no
noun [ C usually singular ] informal uk/ˈnəʊ.nəʊ/ us/ˈnoʊ.noʊ/
不合适(或不可接受)的事物
something that is thought to be unsuitable or unacceptable
Total nudity is still a definite no-no on most of Europe's beaches. 欧洲大多数海滩仍严格禁止全裸。
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