空气污染从某种意义上讲是个缓慢的过程，它会在汽车上或者吸入者的肺脏中慢慢积累。

Air pollution is a somewhat slow process, accumulating slowly on the cars and in the lungs of those who breathe it in.

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当攀登者接近珠穆朗玛峰的顶部时，他们很难吸入空气。

It's very hard for the climbers to take in air as they get near the top of Qomolangma.

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他们还说，认为抽水烟不过偶尔为之，因此吸烟者吸入的烟没有香烟那么多，这种观点同样也是迷信。

So, too, they say, is the idea that because hookah smoking is an occasional activity, users are inhaling much less smoke than cigarette users.

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