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关注：1
2013-05-23 12:21
求翻译：在投影仪发明以前老师需要写板书是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
在投影仪发明以前老师需要写板书
问题补充： |
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2013-05-23 12:21:38
Teachers need to be written before the projector invention of writing on Blackboard
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2013-05-23 12:23:18
In projector, teachers need to be written before the invention GEM book
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2013-05-23 12:24:58
Invents beforehand teacher in the projecting apparatus to need to write the blackboard writing
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2013-05-23 12:26:38
Teachers need to be written before the projector invention of writing on Blackboard
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2013-05-23 12:28:18
正在翻译，请等待...
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