约翰收到点的餐几分钟后，把服务员叫回他的桌子。
A few minutes after receiving his order, John called the waiter back to his table.
助产士及时把她叫回来，让她亲眼看到弟弟的降生。
The midwives called her back in time to see her brother come into the world.
这叫农场定律，也叫回报定律。
This is also called the Law of the Farm or the Law of Reciprocity.
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