repeater
/rɪˈpiːtə(r)/noun
1- a person or thing that repeats something, in particular重复者, 尤指：
1.1
- a firearm which fires several shots without reloading连发火器, 连发枪。
1.2
- a watch or clock which repeats its last strike when required打簧表, 问表; 打簧钟, 连打钟。
1.3
- a device for the automatic retransmission or amplification of an electrically transmitted message重发器, 转发器; 增音器。
1.4
- a railway signal indicating the state of another that is out of sight复式信号灯。