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众所周知，我们人体是由活细胞组成的。这些活细胞不像木材或金属那样容易腐烂，而是能自我成长和补充。既然我们身体的各部分可以更新，为什么我们不能“长生不老”呢？ 最近美国得克萨斯州一位名叫多勒沃的生物学家偶然发现：我们变老是为了活得更久，变老是抑制癌症
As we all know, our body consists of living cells. These living cells are not as rotable as wood or metal, but can grow and supplement themselves. Since all parts of our body can be renewed, why can’t we “live forever?” Recently, a biologist named Dolevo of Texas in the United States stumbled upon it: We are old to live longer, and old to suppress cancer.