n. reciprocity
misc. reciprocity of benefits
其一，以实用为基础的研究进路，强调国家之间的利益互惠，并且把国际正义单单定位于国家之间关系的调节之上。
First, the utility-based approach stresses mutual benefit or reciprocity and sees international justice located solely in the regulation of relationships between states.
他认为，自然选择对于那些曾经是利他主义者的人是有利的，因为我们的祖先生活在小而密集的群体中，人们的利他主义可以指望得到相互间的利益互惠。
He argues that natural selection favored humans who were altruistic because in the small, close-knit groups in which our ancestors lived, altruists could expect reciprocity.
看起来如此自然的对双方都有利的利益上的交流在互惠发生之前也同样给人们的生活造成了阻碍。
That exchange of favors that seems so natural with benefits for both parties is also, unfortunately, what gets in people's way before reciprocity ever occurs.
应用推荐