意思不同：

laugh at意思是“嘲笑,因……而笑”；嘲笑,漠视；取笑(某人)

laugh to意思是：笑;嘲笑 扩展资料

例句：

He could not but laugh to see the sight.

看到这些情景，他不由自主地笑了起来。

He's just started learning. don't laugh at him.

他刚学，别笑他。