三者均可用作名词，表示笑，但有区别：　　

1. laugh 侧重指行为，是可数名词。如：　　

He answered with a laugh. 他笑着回答。　　

Is your mother at home? I heard her laugh. 你妈妈在家吗？我听到她的笑声了。　　

2. laughing 侧重指笑的动作，是不可数名词。如：　　

He held his laughing. 他忍住了笑。　　

3. laughter 具有抽象或概括意义，是不可数名词 。如：　　

In this case there is no cause for laughter. 这没什么好笑的。　　

The room was full of laughter and happiness. 房间里充满了欢声笑语。　　

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