这是虚拟以太网的一个非常典型的应用，因为通信速度非常快，而且不需要任何另外的硬件。
This is a very typical use of virtual Ethernet, because the communication is very fast and no additional hardware is required.
每个交叉口都设有两个交通信号灯，即使是腿长步子快的人要在两个灯变化前走到另一边，那也算幸运的。
Those with a quick pace and long legs will be lucky if they get to the other side with the changing of two traffic lights that are placed at every intersection.
寄出版物的资费比较便宜，但走得不如普通信件快。
The rate for published materials is cheaper, but it doesn‘t go as quickly as ordinary mail.
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