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日本語訳をお願いします!
Cases of animals apparently making sacrifices, occasionally of their own lives, to help others are not rare in nature. But at first sight they are surprising. what is in it for the sacrificer? The usual answer is that the beneficiary is a relative who will be able to carry genes found in the sacrificer into the next generation. In the human species, however, people will make sacrifices for non-relatives or friends. The assumption is that the favor will be paid back at some time in the future. The question is: how can the sacrificer be sure that will happen?
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