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关注：1
2013-05-23 12:21
求翻译：他长期从事物理学研究是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
他长期从事物理学研究
问题补充： |
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2013-05-23 12:21:38
He engaged in physics research
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2013-05-23 12:23:18
He engaged in long-term study physics
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2013-05-23 12:24:58
He is engaged in the physics research for a long time
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2013-05-23 12:26:38
He has long been engaged in physics research
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2013-05-23 12:28:18
He has long been engaged in physics research
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