xkcd

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XKCD中文站,一个关于浪漫、隐喻、数字、以及语言的线上漫画。

Tattoo

Tattoo
I calculate that the electrons in radiation therapy hit you at 99.8% of the speed of light, and the beam used in a 90-second gamma ray therapy session could, if fired with less precision, kill a horse (they did not let me test this).

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