Lysenko gave a deep rumbling laugh at his own joke.

　　李森科對(duì)自己講的笑話報(bào)以朗聲大笑。

　　I just couldn't laugh at his jokes the way I used to.

　　我就是不能像以前那樣笑他講的笑話。

　　When I was a lad his age I would laugh at the strangest things.

　　我是他那么大的小伙子時(shí)，我常嘲笑一些最奇怪的事情。

　　Frank tried to laugh off his aunt's worry.

　　弗蘭克試圖對(duì)他姑媽的煩惱一笑置之。