每一个健康人的肺叶都含有短短的、毛发状的须茬，名叫纤毛。它们向上、向外扫动，将痰液、细菌、以及尘埃推出去。

Every healthy person's lungs contain short hairlike bristles known as cilia, which sweep up and out, pushing mucus, germs, and dirt away.

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每一个健康人的肺叶都含有短短的、毛发状的须茬，名叫纤毛。它们向上、向外扫动，将痰液、细菌、以及尘埃推出去。

Every healthy person's lungs contain short hairlike bristles known as cilia, which sweep up and out, pushing mucus, germs, and dirt away.

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