Once you have a difference that occurs, two cells are difference, those differences can propagate as the cells continue to divide.

一旦产生差异,产生两个不同的细胞,这些差异会伴随着,细胞分裂过程代代相传

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I'm much better having an exception get handled at the time of input than to let that prop -- that value rather propagate through a whole bunch of code until eventually it hits an error 17 calls later, and you have no clue where it came from.

不是我期望的格式,这时我最好有一个异常处理,而不是让其传下去,这个值传到代码的整个分支,最终会导致一个错误17调用的发生，并且你不知道这个错误是哪里来的。

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