to repeat something you have heard, or to broadcast a signal, message, or programme on television or radio

I was told the news first and then I relayed it to the others. 我是第一个被告知这消息的人，接着我又转告了其他人。

TV pictures of the war were relayed around the world by satellite. 有关战争的电视新闻图片通过卫星在全世界进行了转播。

a group of people who continue an activity that others from the same team or organization have been doing previously

Relays of workers kept the machines going through the night. 工人们轮班工作，机器彻夜运转。

After the landslide, volunteers worked in relays to rescue people buried under the rubble. 塌方发生后，志愿者们轮班上阵解救被碎石埋困的人。

a running or swimming race between two or more teams in which each person in the team runs or swims part of the race

a device that reacts to a small change in an electrical current by moving switches or other devices in an electrical circuit