这些洞是特意做的。
zookeeper的编程接口特意做的非常简单。在此之上，你可以实现更高层次的操作，如同步原语，组管理，所有权等等。
The programming interface to ZooKeeper is deliberately simple. With it, however, you can implement higher order operations, such as synchronizations primitives, group membership, ownership, etc.
像这样以礼待人的小事情还有很多，有人特意来为我们做指点，给我们解说社会的情况，或者就是为了让我们玩得开心一点。
There were many other small courtesies, of people going out of their way to show us things, explain aspects of the society, or simply try to make sure we had a good time.
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