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Mouth breathing can be a problem, especially in the winter.
张口呼吸本身就对健康不利，在冬季尤甚。
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You get oxygen by breathing air in through your nose and mouth.
你通过鼻子和嘴巴呼吸空气来得到氧气。
youdao
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You get oxygen by breathing air in through your nose and mouth.
你通过鼻子和嘴巴呼吸空气来得到氧气。
youdao