1. cutting off the electric current on certain lines when the demand becomes greater than the supply. 
   当电量不够用时减少某些线路的电流。
2. current flowing in one circuit can switch on and off a current in a second circuit. 
   当电流在一个线路中流动同时关闭另一个线路。
3. To link(two circuits or currents) as by magnetic induction. 
   连接如通过电磁感应连接（两条线路或电流）
4. Device used to prevent excessive voltages and/or currents on a line from damaging exchange equipment or subscribers′ apparatus. 
   在线路上用来防止过电压或过电流损坏交换设备或用户设备的装置。
5. The waves of electric current pass along the line and finally reach the receiver of the telephone held by the person you are speaking to. 
   电流波沿着线路传输，最后到达你正同他通话的那个人所用的听筒。

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