原因很简单，它们限制自己只能跳这么高。
The reason is simple. They have conditioned themselves to jump just so high.
水肺潜水、笨猪跳及激流是受保的业馀活动，其限制是多少？
Scuba Diving, Bungee Jump or Rafting are under covered. What is the restriction for those activities?
在网络设计中，为了保证网络服务质量，需要对网络节点间的跳数进行限制。
In order to maintain the quality of service, it is necessary to add some hop-constrain between nodes in network.
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