相比之下，富裕国家的车辆平均只有1.3个乘客(而且随着时间的推延，还呈现下降的趋势)，而且几乎从未用作交换的手段。

By contrast, vehicles in rich countries have averaged perhaps 1.3 occupants (with the number falling over time) and were almost never used as a form of exchange.

youdao

对线路交换、消息交换、包交换，虚拟旁通和直通的平均通信延迟时间以及直通的平均请求响应时间进有了分析。

This paper analyses the average communication delay of circuit-switching, message switching, packet-switching, virtual cut-through and direct-passing and, the average response time of direct-passing.

youdao