those are common senses, and are sporadic around various website

来源: englishreader 于 2009-09-13 12:30:10 [] [旧帖] [给我悄悄话] 阅读数 : (56 bytes)
本帖于 2009-09-15 05:58:49 时间, 由版主 林贝卡 编辑

The orignal author didn't cite any source on his rules?

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