Both sate an appetite that is there beyond its strict biological need.
这两者都是满足超出严格意义上的生理需求的欲望的。
If it works, it will be a good example of the value of thinking about biological problems from an evolutionary perspective.
如果这有用的话,从进化的前景来看,这将会是一个良好的例子来考虑生物学的难题。
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