written all over someone's face
US /ˈrɪt.ən ɔl ˈoʊ.vər ˈsʌm.wʌnz feɪs/
UK /ˈrɪt.ən ɔl ˈoʊ.vər ˈsʌm.wʌnz feɪs/

1.
溢于言表, 写在脸上
if an emotion or thought is written all over someone's face, it is very obvious to other people
:
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Her disappointment was written all over her face when she didn't get the job.
她没得到那份工作时,失望之情溢于言表。
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You don't have to tell me, it's written all over your face that you're in love.
你不用告诉我,你恋爱了,这都写在你脸上了。