laugher improves our health against illness by 40%为什么用by

是 laughter
很多时候,欢笑是对痛苦最好的答案

laugh
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vi.
1.笑;嘲笑[(+at)]
They laughed at their own failure.
他们对自己的失败一笑置之.
The jokes made everyone laugh.
那些笑话使每个人都笑了起来.
vt.
1.以笑表示
He laughed his approval.
他以笑表示同意.
2.使笑得[O8]
We laughed ourselves hoarse.
我们笑得嗓子都哑了.
3.用嘲笑逼使对方[O]
The poor actor was laughed off the stage.
这可怜的演员被笑声赶下了舞台.
n.
1.笑,笑声[C]
She gave a hearty laugh.
她爽朗地笑了起来.
2.引人发笑的事情[S]
The funny book had a laugh on every page.
这本滑稽的书每一页上都有令人发笑的地方.
laughter
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n.
1.笑;笑声[U]
She burst into laughter.
她突然大笑起来
不存在laugher这个词,至少词典里找不到