戴假面具

dàijiǎmiànjù ㄉㄞˋ ㄐㄧㄚˇ ㄇㄧㄢˋ ㄐㄩˋ

    • to put on a false front and hide one's true self

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Saying俗语俗語

Idiom惯用语 · In everyday use

Literally
wear a false mask
Meaning
To put on a false front and hide one's true self. Critical.

Sources