If so, then from an evolutionary standpoint any kindness towards an animal that an animal shows towards another animal--is a mystery.
如果这样,从进化论观点看,任何对动物善意行为,一个动物对另一个动物,是个谜团。
And I want to focus particularly on emotions that generate kind or altruistic behavior.
我想特别讲解能让人产生善意,利他主义行为的情感。
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