1. In ancient times the messages were relayed from one place to another. 古时候信息是用接力的方式从一地传送到另一地。
2. The ladder diagram can be designed and be run basing on the relay controlling circuit. 在继电器控制线路的基础上，设计出梯形图并进行现场调试。
3. In packet networks, ATM, frame relay and IP organize and transmit data in collections of bytes, or packets. 在包交换网中，ATM、帧中继和IP是以字节的集合（即包）来组织和发送数据的。
英英解释
n.
1. the act of passing something along from one person or group to another
2. a crew of workers who relieve another crew
3. a fresh team to relieve weary draft animals
4. electrical device such that current flowing through it in one circuit can switch on and off a curren v.
1. pass along
2. control or operate by relay
