But there is a heavy cost. Spying infringes everyone's freedom, everyone's privacy, not just that of the enemy.

但这样一来就要付出沉重的代价，因为侦查在针对敌人的同时也损害了人们的自由和隐私。

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As you can see, there is little CPU penalty to maintaining the index (1 percent in our test case), but a heavy search cost of 20 percent CPU usage.

可以看到，只需要很少的CPU资源来维护索引(在我们的测试用例中是1%)，但是却需要使用高达20%的CPU资源进行搜索。

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Mobile multicast is a research hotspot of mobile network, but most of mobile multicast schemes suffer from the long multicast disruption time and heavy protocol cost.

移动组播是移动互联网络技术的一个研究热点，但现有移动组播方案存在着组播中断时间长、协议开销大等问题。

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