在连接握手时，SSL利用公钥算法和数字证书在素不相识的各方之间建立信任并交换当前会话的私钥。

At a connection handshake, SSL utilizes public key algorithms and digital certificates to establish trust between parties that haven't met before and exchange private keys for the current session.

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所以这个数字包括已连接的主线和用于将来连接的可用主线数，包括交换技术操作主线(测试号码)。

This number includes, therefore, main lines already connected and main lines available for future connection, including those used for the technical operation of the exchange (test Numbers).

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指连接到数字交换机的主线百分比。

Refers to the per cent of main lines connected to digital exchanges.

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