When the cops left, a power truck arrived.

警察走了以后，来了辆电力公司的卡车。

Eventually, the lights came back on and the power truck went away.

最后，电流又接通了，电力公司的卡车开走了。

The biofuel helps power supermarket trucks.

生物燃料有助于为超市卡车提供动力。