这第一个信号通常是生理上的，正如上文所述。
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.
如上文所述，每个会话对于给定的全局变量都具有自己的私有值。
As mentioned before, each session has its own private value of a given global variable.
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