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英语
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What is about 20% of the air?
快
要答案不要翻译，谢谢
about one fifth of the air is oxygen
about four fifths of the air is nitrogen. 两句话帮忙也翻译一下吧，谢谢
人气：315 ℃ 时间：2020-03-24 04:40:57
解答
oxygen
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