做學問的,PF!
所有跟帖:
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做學問不敢當。動動腦筋,有利於預防老年癡呆。
-ntotl-
♂
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12/02/2012 postreply
22:08:01
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very good analysis! Learned, thank you!
-sportwoman-
♀
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12/03/2012 postreply
04:22:59