I'm sure that laughter has been selected by evolution as a useful device for promoting social communication.
我想进化肯定选择了笑作为促进社会交往的有用工具。
The laughter finding makes a great deal of sense, and laughter has been described as more like a different way of breathing than a way of speaking.
笑的作用，非常有意义，与语言表达方式相比，笑更多地被描述为一种不同的呼吸方式。
Laughter has been shown to relieve stress, stimulate blood flow, relax muscles, promote a healthy immune system and relieve pain.
笑声会释放压力，加速血液循环，放松肌肉，提升强健的免疫系统，缓解疼痛。
Laughter has been shown to relieve stress, stimulate blood flow, relax muscles, promote a healthy immune system and relieve pain.
笑声会释放压力，加速血液循环，放松肌肉，提升强健的免疫系统，缓解疼痛。
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