Often, such systems consist of the critical servers, the network backbone, and messaging pieces such as E-mail and telephony, as shown in Figure 1.

通常，此类系统包括关键服务器、网络中枢和诸如电子邮件及语音等消息部分，如图1所示。

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Often, such systems consist of the critical servers, the network backbone, and messaging pieces such as E-mail and telephony, as shown in Figure 1.

通常，此类系统包括关键服务器、网络中枢和诸如电子邮件及语音等消息部分，如图1所示。

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