That is the law of reciprocity.
这就是互动的法则。
This is called The Law of Reciprocity.
这就是所谓的互惠原则。
The Law of Reciprocity is strong in people.
互惠主义的原则在人群中是十分受用的。
This is also called the Law of the Farm or the Law of Reciprocity.
这叫农场定律，也叫回报定律。
The Law of Reciprocity: Whatever you give is what you're going to get.
法则二:互惠。你付出什么便意味着你将得到什么。
The Law of Reciprocity: Whatever you give is what you're going to get.
法则二:互惠。你付出什么便意味着你将得到什么。
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