动物行为学家对动物净化的基础以及天生的能力进行研究，例如蜘蛛不需要向父母学习就懂得如何织网。
Ethologists study the evolutionary basis and development of animals' innate behaviors, like a spider knowing how to make a web without learning from a parent.
动物的生命中有大量时间是用于繁殖的，我们在自然界所观察到的利他性自我牺牲行为，大部分是父母为其下一代做的。
Much of an animal's life is devoted to reproduction, and most of the ACTS of altruistic self-sacrifice that are observed in nature are performed by parents towards their young.
动物的生命中有大量时间是用于繁殖的，我们在自然界所观察到的利他性自我牺牲行为，大部分是父母为其下一代做的。
Much of an animal "s life is devoted to reproduction, and most of the ACTS of altruistic self-sacrifice that are observed in nature are performed by parents towards their young."
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