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In places, there are a million pieces of plastic per square kilometre.
在某些地方，每平方公里甚至有100万件塑料垃圾。
youdao
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In one month, dust fall can reach as much as 17kg per square kilometre.
在一个月的时间里，每平方公里差不多要落下17kg的灰尘。
youdao
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In one month, dust fall can reach as much as 17kg per square kilometre.
在一个月的时间里，每平方公里差不多要落下17kg的灰尘。
youdao