One of my friends is allergic to unfresh air.
我的一个朋友对污浊的空气过敏。
The heat of the lights made an unfresh smell in the frosty air.
泛光灯散发出来的热给寒冷的空气带来了不清新的气味。
The environment is awful because the population is too large and too much rubbish make the air unfresh.
因为众多的人口和大量的垃圾污染了空气，所以（城市）环境是很可怕的。
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