达尔文的进化论是一个动态的模型，在这个动态过程（即自然选择的过程）中，物种通过 “有利变异（profitable variation）” 来适应环境，并最终得以生存。
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拟态是无数代自然选择和遗传变异的进化而获得的有利特征的结果。
Mimicry arises as the result of evolution through natural selection and the occurrence of random genetic mutations that lead over many generations to the appearance of favorable characteristics.
有一些变异不改变“单词”，即基因；有一些会改变单词但不会改变它的意思；而有一些变异则会改变单词的含义，产生有利或有害的后果。
Some do not change the "words" that are the genes; some change a word but not its meaning; and some change the meaning in a way that can be beneficial or harmful.
一种可能性是只有当7r不是普遍的，且变异体间某类均衡出现时它的影响才有利。
One possibility is that its effects are beneficial only when they are not universal, and some sort of equilibrium between variants emerges.
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