translation.en: Well by measuring oxytocin we found that the more money the second person received, the more their brain produced oxytocin, and the more oxytocin on board, the more money they returned.
translation.zh: 通过测量催产素水平， 我们发现，第二个人收到的钱越多， 他们的大脑生产催产素就越卖力， 而催产素水平越高， 他们归还的钱就越多。