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标题: Why does a pencil seem heavy when you write with it for a long time? [打印本页]

作者: xiaomeixin    时间: 2011-7-10 12:39     标题: Why does a pencil seem heavy when you write with it for a long time?

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作者: luqingling2599    时间: 2011-7-14 22:19

you are use the pencil everyday, it is become your best friend,maybe deeply in your mind.




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