If you touch a live wire, you will get an electric shock.

如果触动电线，你会触电的。

She seems to have inexhaustible energy.; She's a live wire.

她仿佛有使不完的劲。

That child's a real live wire.

那孩子生龙活虎般活泼好动。

It's dangerous to touch a live wire.

触摸带电的电线是最危险的。

We can insulate a live wire with rubber.

我们可用橡胶使带电的电线绝缘。