Well, the reason for thinking otherwise, the reason for not being utterly dismissive of this suggestion, is that when people get ill, terminally ill, it often seems to take them by surprise.

其他的想法产生的原因，人们没有完全摒弃这个假设的原因，是当人们得病，病入膏肓时，这通常让人措手不及。

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Red blood cells are terminally differentiated cells.

血红细胞是一种终末分化细胞

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