You make the point very clear for me.

来源: Math-Mom 于 2012-09-06 14:14:02 [] [旧帖] [给我悄悄话] 阅读数 : (84 bytes)
回答: $是硬道理. 由 上山下乡 于 2012-09-06 07:55:31

I will transfer all the opinion to my friend. Thank you all for your inputes.

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