英语语法分析

Older cell phone batteries were often NiCad.

老式手机一般都采用镍镉电池。

However, recharging NiCad batteries is a black art.

然而，给镍镉电池充电却是一个黑色艺术。

NiCad batteries have powered everything from cordless screwdrivers to emergency lights.

镍镉电池的适用对象无所不包，从无线起子机到紧急照明灯皆有。