土地登记了，但政策可能随时变化；企业注册了，但规则可能朝令夕改；合同签了，但执行未必稳定。产权的形式建立起来了，但产权保护的实质还不够，产权的安全感却仍然脆弱。这正是秘鲁制度困境的核心所在。
The algorithm maintains a running "best distance" that starts at infinity. As it walks the tree, it checks each visited point and updates the best distance if it finds something closer. Before recursing into a child node, it checks whether the closest possible point in that child's bounding box is farther than the current best. If so, the entire subtree gets pruned.
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The couple may decide to have a second baby, after which surgeons will remove the transplanted womb. This is to save Bell from taking a lifetime of strong drugs to prevent the body's immune system attacking the transplanted organ.，这一点在同城约会中也有详细论述