It had been known for some time that higher carbon的翻译是：什么意思？中文翻译英文，英文翻译中文，怎么说？-青云在线翻译网

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匿名	关注：1 2013-05-23 12:21 求翻译：It had been known for some time that higher carbon是什么意思？待解决悬赏分：1 - 离问题结束还有 It had been known for some time that higher carbon 问题补充：

匿名	2013-05-23 12:21:38 它已经知道了一段时间，较高的碳

匿名	2013-05-23 12:23:18 它已知道,提高碳

匿名	2013-05-23 12:24:58

匿名	2013-05-23 12:26:38 它已存在一段时间，更高的碳

匿名	2013-05-23 12:28:18

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求翻译：It had been known for some time that higher carbon是什么意思？