我不学经济,不知道其确切定义。
所有跟帖:
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I believe it's the ratio between people in the workforce vs
-pinkdreams-
♀
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01/13/2012 postreply
10:33:07
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我刚刚查了一下,
-老看客-
♂
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01/13/2012 postreply
11:09:26