无电镀工艺不需要外部电源。

The electroless process does not require an external power source.

但是目前还需要提供外部电源来启动这个过程。

Until now, they explained, an external source of electricity was required in order to power the process.

电力公司说，由于外部电源厂系统故障，由于外部电源供应问题导致了反应堆停运。

Tepco said the reactors shut due to the loss of offsite power due to the malfunction of one of two off-site power systems.

这次强烈的地震和海啸毁坏了电厂的外部电源和以柴油为动力的后备电源。这些电源是用于和电站紧急情况下为冷却系统提供电力供应的电源。

The quake and tsunami cut the supply of off-site power to the plant and diesel generators intended to provide back-up electricity to the cooling system.

在机械开关的情况下，电路不需要外部电源实现这个功能。

In the case of a mechanical switch, this circuit would require no external power to implement this function.

简化了外部电源供应故障维修事件中的权力和紧凑的设计节省了空间，并确保安静运行。

The external power supply simplifies maintenance in the event of a power supply failure and its compact design saves space and ensures silent operation.

当反应堆停运，泵将冷却水连续通过燃料棒，水泵的电力通常是来自外部电源。

When a reactor shuts, pumps continue to move water over the fuel rods. The electricity to run the pumps usually comes from off-site power supplies brought in by transmission lines.