Yes.Only estimat,we don't know the time,it has relation with the

回答: 0.4%?贫论员2011-08-15 12:07:10

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It has relation with the rotation of the Earth. -jinjing- 给 jinjing 发送悄悄话 (0 bytes) () 08/15/2011 postreply 16:50:46

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