dictionnaire Polonais - Anglais
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zachować pokerową twarz Anglais:
1. 
keep a straight face
I couldn’t keep a straight face whenever I looked at Sam even though I should have stayed serious because it was such an important meeting.
Being around such a jester as Marvin and keep a straight face is impossible. If he ever becomes a comedian he will be the best.
If someone tells jokes I coudn't keep a straight face
put a brave face on it 