These numbers are arbitrary and don't matter too much, except that a large "vagrant" pool will dilute the value of cell selection, while a small pool will limit the element of chance.
这些数字是任意的，不太重要，只不过，一个大的“无限制”的池将 使细胞选择的值的适合度降低，而一个小的池将限制元素的机会。
And don't limit the books to a few essentials... have a generous selection of a wide variety of books.
不要总是一些必备的书…各种各类的书都准备一些。
The object of natural selection is the quasi-species, and the existence of the error threshold places a limit on the genome length that the organisms carry.
自然选择的目标是准物种，而误差阈的存在对生物体所能携带的基因组的长度施加了一个限制。
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