理论上说来，新的个体是和双亲一样适应的，由于变异或增或减会有些微小的变化。
The new individual will, in theory, be as fit as the parents, plus or minus a small variance caused by the mutation.
l在过程和步骤已经确定的给定系统中，一阶变化是个变异，它使系统本身相对的不变。
First-order change is a variation in the way processes and procedures have been done in a given system, leaving the system itself relatively unchanged.
一个SNP就是只在一个基因序列的一个核苷酸中发生的变异；就像一个拼写变化只影响一个罕见的长单词中的一个字母。
A SNP is a variation in just one nucleotide of a genetic sequence; think of it as a spelling change affecting just one letter in an uncommonly long word.
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