我有天又翻出那信，读着读着忍不住笑了起来。

I found it again the other day, and Icouldn't help laughing as I read it.

youdao

一看到如此有趣的东西，我就忍不住笑了起来。

On seeing such a funny thing, I can't help laughing.

youdao

我看了旁边的鸡蛋，忍不住笑了起来。

I looked at the eggs next to me, and couldn't help laughing.

youdao

我忍不住大笑了起来。

I could not help but burst into laughter.

youdao

我简直忍不住笑了起来！

I could hardly keep from laughing!

youdao

我简直忍不住笑了起来！

I could hardly keep from laughing!

youdao