物种受外界环境的影响，进行基因的自我调节和转变，淘汰不适应环境的基因，产生可有效适应环境的基因
随后，正向选择会固定有益突变，加强新产生的功能。
Then these mutations create new but weakly active functions in one daughter gene.
基因重复的最主要贡献是在进化过程中为基因突变和正向选择提供遗传材料，为基因的进化提供可能性。
The main contribution of gene duplication is providing materials for mutation, transition and selection, and furthermore, a probability for genetic evolution.
客户正向我们索取比我们现在可以提供的更多的有关用户界面、代码原型和工具选择的信息。
The customer was pushing us for more information about the user interface, code prototypes, and tool selection than we were ready to provide at this time.
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