He could not help laughing.

他忍不住笑了。

She couldn't help laughing at his jokes.

她忍不住因为他的笑话笑出声来。

I laughed in spite of myself. / I couldn’t help laughing.

我不由自主地笑了。

He couldn’t help laughing up his sleeve at his opponent’s anxiety.

看到对手着急的样子，他不禁心里暗笑。

I can't help laughing when I think about what happened to you both!

想到你们俩的遭遇我就忍不住笑！

I can't help laughing loudly.

我不禁大笑起来。

We couldn't help laughing at the joke.

听了那个笑话，我们禁不住大笑起来。

On hearing the joke we couldn't help laughing.

一听到这笑话我们不禁笑了起来。

He tried to stay his joy, but couldn't help laughing.

他试图掩盖住他的喜悦，可还是忍不住笑了起来。

People cannot help laughing at the mention of Chaplin's films.

一提到卓别林的影片，人们不禁要笑。