How do you know it is the same person or "after and before"?

How do you know it is the same person or "after and before"?

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送交者: yell 于 2008-10-12, 20:46:05:

回答: Before and after 由 HunHunSheng 于 2008-10-12, 20:26:39:

右边的是"before", 左边的是"after" (无内容) - yell (0 bytes) 2008-10-12, 20:50:13 (266420)