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关注：1
2013-05-23 12:21
求翻译：the primary source for both is the combustion of fuels,mainly coal,containing sulfur in the presense of air.是什么意思？ 待解决
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- 离问题结束还有
the primary source for both is the combustion of fuels,mainly coal,containing sulfur in the presense of air.
问题补充： |
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