Ironically, it's natural selection that keeps the human appendix from shrinking away completely.
具有讽刺意味的是，正是自然选择使得人类的阑尾没有完全消失掉。
The human appendix is a small dead-end tube connected to the cecum, or ascending colon, one section of the large intestine.
人的阑尾是个很小的一端闭锁的细长盲管，它的另一端连结盲肠，也叫升结肠，属于大肠的一部分。
Darwin thought that only a few animals have an appendix and that the human version was what was left of a digestive organ called the cecum.
达尔文认为，仅仅只有少部分动物具有阑尾，他还认为人的阑尾是盲肠进化过程中残留下来的部分。
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