straight face片語

不露笑容的表情、繃著的臉、正經的面孔

I could barely keep a straight face during his ridiculous excuse.

他講那個荒謬的藉口時，我幾乎忍不住要笑出來。

一本正經地、不動聲色地用於 with a straight face

She told the whole lie with a straight face.

她一本正經地把整個謊話講完。

一本正經的、不露表情的

He gave a straight-faced answer that made everyone laugh.

他一本正經地回答，卻讓大家都笑了。