wear your heart on your sleeve
US /wer yʊr hɑrt ɑn yʊr sliv/
UK /wer yʊr hɑrt ɑn yʊr sliv/

1.
表露真情, 感情外露
to openly show your emotions rather than hiding them
:
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She tends to wear her heart on her sleeve, so you always know how she's feeling.
她總是表露真情,所以你總能知道她的感受。
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As an actor, it's important to be able to wear your heart on your sleeve and convey genuine emotion.
作為一名演員,能夠表露真情並傳達真實情感是很重要的。