main source of electric power的意思|示意

The nuclear plant lost its main source of electric power to drive the pumps, and the tsunami knocked out the backup diesel generators that were supposed to drive the pumps in an emergency.

核电站失去了驱动冷却水泵的主要电力来源，海啸损毁了本应在紧急情况下驱动水泵的备用柴油发电机。

The output part of the electronic circuit controls a main electric power source, an acoustic horn loop and a brake system.

电子线路输出部分控制车辆的用电总电源、喇叭回路及刹车系统。