High places are free of air pollution.
高处没有空气污染。
No area in the world is completely free of air pollution. We must take measures to control it.
世界没有不遭空气污染的地方,我们必须采取措施加以控制。
It is free of air-traffic congestion, has no ban on night flights and has plenty of runway space.
迪拜没有空中交通堵塞,对夜间飞行没有限制,有足够的跑道空间。
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