角系数的相对性（reciprocity rule） x d a 1, d a 2 由 d a1发 出 而 落 到 d a 2 上 的 辐 射 能 d a1向 外 发 出 的 辐 射 能 i b 1 d a1 co s 1 d a 2 co...
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Psychologists call this the reciprocity rule, and it is a rule that all societies honour.
心理学家把这种行为称为互惠原则，这是所有社会都遵循的原则。
The researchers say the reciprocity rule explains their findings — people felt obligated to return the act of generosity.
实验者称交互作用法使这项研究的最好解释——人们在接受他人慷慨后感觉自己有义务作出回报。
Treat others as you would like to be treated: this is known as the Ethic of Reciprocity, or the "Golden Rule". Imagine if everyone lived by this principle.
自己想要怎样被对待就这样对待别人：这被称作平等的对待，或“黄金法则' .”想像一下如果都按这个原则会怎样。
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