这第一个信号通常是生理上的，正如上文所述。
如上文所述，消息流安全性实现依赖于外部安全性提供者。
As mentioned above, the message flow security implementation depends on an external security provider.
Capability用于表示一个候选服务，如上文所述。
A Capability is used to represent a candidate service, as we mentioned above.
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