老师让学生们一个接一个地把信息传递给全班同学。

The teacher asked students to ___relay the information to the whole class one by one.

我们队在400米接力赛中获得了第二名。

Our team came in second place in the 400-meter ___relay.

电工检查了控制照明系统的继电器。

The electrician checked the ___relays controlling the lighting system.