keep a straight face

基本解釋

All in all, the experience made it hard for me to keep a straight face when people referred to whale as a "delicacy."
總之，這次體驗讓我很難理解為什么人們會把鯨魚當(dāng)作一種美食。
She put pink and green stripes in her hair and looked rather like a Neapolitan ice cream. I couldn't keep a straight face when she asked me what I thought about it.
她在頭發(fā)上扎著粉紅夾綠色的布條，看上去就像夾層花色冰磚當(dāng)她問我象什么時，我禁不住笑了出來。
dict.cn
Stop joking around. I'm trying to keep a straight face.
別鬧了，我正試著要板著面孔。