两个节点间的逻辑距离，即一个跃距为从一个节点到邻近一个节点的距离。

The logical distance between two nodes. One hop is the distance from one node to an adjacent node.

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由靠近用户的缓存对请求作出应答，可以减少网络跃距和网络延迟，从而尽可能地提高响应能力。

Replying to requests by caches as close to the user as possible improves responsiveness by reducing network hops and network latency.

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当天罗西乘一架小飞机从法国出发，当飞机飞至距海面2500米的高空时，罗西背着碳制动力机翼一跃而下，并以每小时200多公里的速度飞行。

With the carbon wing strapped to his back, Rossy had leapt out of a small plane at an altitude of 2, 500 metres over the French coast before jetting off at speeds of more than 200 kilometres per hour.

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