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关注：1
2013-05-23 12:21
求翻译：他发明电灯时，为了找到合适的灯丝，先后用了一千六百多种材料是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
他发明电灯时，为了找到合适的灯丝，先后用了一千六百多种材料
问题补充： |
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2013-05-23 12:21:38
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2013-05-23 12:23:18
He invent electric, in order to find a suitable filament, been used by more than 1,600 such material
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2013-05-23 12:24:58
When he invents the electric lamp, in order to find the appropriate filament, has used 1600 many kinds of materials successively
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2013-05-23 12:26:38
When he invented the electric light, in order to find the right filament, has spent more than 1600 material
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2013-05-23 12:28:18
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