科研速递论坛

标题: empty [打印本页]

作者: maggie 时间: 2013-3-18 19:17
标题: empty
A: When I stand on my head the blood rushes to my head, but when I stand on my feet the blood doesn't rush to my feet. Why is this?
B: It's because your feet aren't empty.

欢迎光临科研速递论坛 (http://expaper.cn/)