你知道吗？为什么鼻子每次只堵一边？
<p><span word="Though">Though</span> <span word="you">you</span> <span word="may">may</span> <span word="not">not</span> <span word="pay">pay</span> <span word="attention">attention</span> <span word="to">to</span> <span word="it">it</span> <span word="unless">unless</span> <span word="you">you</span>'<span word="re">re</span> <span word="sick">sick</span>, <span word="you">you</span>'<span word="re">re</span> <span word="always">always</span> <span word="breathing">breathing</span> <span word="more">more</span> <span word="heavily">heavily</span> <span word="from">from</span> <span word="one">one</span> <span word="nostril">nostril</span> <span word="than">than</span> <span word="the">the</span> <span word="other">other</span>.</p><p>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。</p><p><span word="During">During</span> <span word="the">the</span> <span word="day">day</span>, <span word="the">the</span> <span word="sides">sides</span> <span word="switch">switch</span> <span word="and">and</span> <span word="the">the</span> <span word="other">other</span> <span word="nostril">nostril</span> <span word="goes">goes</span> <span word="into">into</span> '<span word="work">work</span> <span word="mode">mode</span>', <span word="but">but</span> <span word="why">why</span>?</p><p>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？</p>
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