About this episode
笑，是人的一种平和心态以及善良的内心表现，同时，也是体内安多芬分泌物增高的时候。人的心情处于正常状态时，在与他人交谈期间就会呈现为平和的心理作用并用微笑来展现人与人之间的善意交往。善与恶是人的心理作用，也是动物进化的结果。
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