词典释义：
a group of people or animals engaged in a task or activity for a fixed period of time and then replaced by a similar group
接替或替换的一组人（或动物）
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the wagons were pulled by relays of horses 货车由一组接一组的马匹轮流拉
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gangs of workers were sent in relays .工人被分批轮流派出。
[usu. as modifier]a race between teams of runners, each team member in turn covering part of the total distance
接力赛
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a 550-metre relay race .５５０米接力赛。
an electrical device, typically incorporating an electromagnet, which is activated by a current or signal in one circuit to open or close another circuit
继电器。
a device to receive, reinforce, and retransmit a broadcast or programme
（接收、加强并转播无线电或电视广播节目的）中继设备。
a message or programme transmitted by such a device
中继转播的信息（或节目）
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a relay of a performance live from the concert hall .从音乐厅现场通过中继站实况转播的表演。
[with obj.]receive and pass on (information or a message)
转达信息，转告（消息）
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she intended to relay everything she had learned .她打算把她知道的东西都传授出来。
broadcast (something) by passing signals received from elsewhere through a transmitting station
转播；中继转发
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the speech was relayed live from the palace .演讲从宫殿现场经过中继站实况转播。
lay again or differently
重新铺设，再铺设
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they plan to relay about half a mile of the track .他们计划重新铺设约半英里距离的轨道。
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torque relay 火炬接力
真题例句：
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relay race 接力赛
真题例句：
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relay satellite 中继卫星
真题例句：
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relay team 替补队
真题例句：
"late Middle English （referring to the provision of fresh hounds on the track of a deer）： from Old French
