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Though you may not pay attention to it unless you're sick, you're always breathing more heavily from one nostril than the other. 除非生病了，否则你可能并不会注意到，你的一个鼻孔总是比另外一个呼吸更费力。 During the day, the sides switch and the other nostril goes into 'work mode', but why? 一天之中，两边的鼻孔可能会交换，另一侧的鼻孔进入“工作模式”。但这是为什么呢？ | 
