换句话说，如果一个流量类别没有配置带宽，那么未被使用的带宽会被其他类（class）。
In other words, if a traffic class is not using its configured bandwidth, any unused bandwidth is shared among the other classes.
2008年至2009年，流量出现下降的惟一一个类别是OTA的机票业务，降幅为15%。
The only category to show a decline in traffic from 2008 through 2009 was the OTA air category which is down 15%.
支持多个通信类别的网桥能够支持加速类别的流量。
Bridges that support more than one traffic class are able to support expedited classes of traffic.
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