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关注：1
2013-05-23 12:21
求翻译：这是 21 世纪化学的第二个重大难题。是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
这是 21 世纪化学的第二个重大难题。
问题补充： |
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2013-05-23 12:21:38
This is the second major challenge of the 21st century chemistry.
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2013-05-23 12:23:18
This is the 21st century chemistry in the first 2 of the major challenges.
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2013-05-23 12:24:58
This is the 21st century chemistry second significant difficult problem.
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2013-05-23 12:26:38
This is the second major challenge of the 21st century chemistry.
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2013-05-23 12:28:18
正在翻译，请等待...
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