有保证的服务品质包含三种参数：封包传输延迟、封包延迟变异，以及封包遗失率。
Guaranteed QoS includes three basic parameters: packet transfer delay, packet delay variation and packet loss rate.
因为针对每一个封包标头的IP地址进行转换，所以会带来一些交换路径的延迟。
Switching path delays are introduced because of the translation of each IP address within the packet headers.
因为针对每一个封包标头的IP地址进行转换，所以会带来一些交换路径的延迟。
Switching path delays are introduced because of the translation of each IP address within the packet headers.
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