送交者: HunHunSheng 于 2007-01-23, 18:21:56:

回答: 比较容易解答。 由 mirror 于 2007-01-23, 17:27:01:

• only when there is one star, and small planets like those in the Solar system - steven (195 bytes) 2007-01-23, 21:44:52 (122451)

加跟贴