n. succedaneum ; surrogate
教皇被称做基督的代理者。
比如，在地震时，代理者间会互相叫价以分配救护车。
In the case of an earthquake, for instance, the agents bid among themselves to allocate ambulances.
该方案可用于任意接入结构，每个托管代理者的子密钥能多次使用。
This scheme is used in task input structure, and every sub key of escrow agent could be reused for many times.
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