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发表于 2003-9-3 06:39
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旧书摘――云随雁字长
这两天考试看书仔细一点,看到一段特别有意思的话。先补充一下背景知识。在生命体内有一种现象称为“细胞程序性死亡”或者“细胞凋亡”。也就是说不是由于外界不良因素的刺激,而是细胞自己到了一定的时候就“自取灭亡”。这种过程是有严格的调控途径的,对维持生命体正常的新陈代谢很重要。一个人,一天死亡的细胞数量大约是10的11次方。我们一年之中,死掉的细胞总数大约和我们的体重相等。恩,就是这么个背景,然后有一段话:
By the time I was born, more of me had died than survived. It was no wonder that I cannot remember; during that time I went through brain after brain for nine months, finally contriving the one model that could be human, equipped for language. |
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