He kept a straight face and remained speechless.
他绷着脸不说话。
I kept a straight face as long as I could, but I finally had to crack up.
我尽量板着面孔，但最后还是控制不住失声大笑起来。
Tom kept a straight face while telling the joke.
汤姆说这一笑话时，丝毫不露声色。
All of them kept a straight face when they heard the non funny joke.
听到这个并不好笑的笑话，他们都板着脸。
All of them kept a straight face when they heard the non funny joke.
听到这个并不好笑的笑话，他们都板着脸。
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