Because he was helping another boy to understand

来源: iforgotpwd 于 2013-03-07 11:35:01 [] [旧帖] [给我悄悄话] 阅读数 : (79 bytes)
回答: how can you so judgemetal 由 newcomerST 于 2013-03-07 11:33:05

That means he knew the formula already, he did not need to write it out.

所有跟帖： 

• waht's part of your common sense tell you -newcomerST- ♀ 给 newcomerST 发送悄悄话 (409 bytes) () 03/07/2013 postreply 11:42:22

请您先登陆，再发跟帖！