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关注：1
2013-05-23 12:21
求翻译：我曾经开发并改进一种新装置，使材料性能提升两倍。是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
我曾经开发并改进一种新装置，使材料性能提升两倍。
问题补充： |
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2013-05-23 12:21:38
I have developed a new and improved device performance and the material twice.
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2013-05-23 12:23:18
I have developed a new device, and to improve the material performance upgrade two times.
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2013-05-23 12:24:58
I once developed and improve one kind of new installment, caused the material performance to promote two times.
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2013-05-23 12:26:38
I used to develop and improve a new device, materials performance twice.
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2013-05-23 12:28:18
I once developed and improved a kind of new installation and made the material performance promote by twice.
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