癌細胞或其他出錯的細胞總是有。年輕人免疫係統清除的快，老年人免疫係統弱了。癌細胞增殖到無法控製的數量就是癌症了。

來源: 我這是咋啦於 2015-08-06 11:17:26 [舊帖] [給我悄悄話] 本文已被閱讀：次

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