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But, as you know, air is only 20% oxygen, the balance being nitrogen.
但是你知道空气中只有20%的是氧气，大部分的是氮气。
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- 来自原声例句
But, as you know, air is only 20% oxygen, the balance being nitrogen.
但是你知道空气中只有20%的是氧气，大部分的是氮气。
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