将句子译成汉语:sometimes the polluted air is so thick that it is like a quilt over a city

问题描述:

将句子译成汉语:sometimes the polluted air is so thick that it is like a quilt over a city

有时候被污染的空气如此之浓以至于就像盖住城市的被褥(被子)一样.
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