人类的变化形式受限于我们基因可能的那些排列。
Variation among humans is limited to the possible permutations of our genes.
不过，您需要记住，对于更大的环境会有许多变化形式。
However, there are many variations that you need to keep in mind to address larger environments.
大规模转换然后客户化定制：这是选项b的一种变化形式。
Large-scale transformation and then customize: This is a variation of option b.
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