The system is powered by a 12-volt receiver and a 12-volt transmitter that can be recharged from the mains or an emergency vehicle.是什么意思_The system is powered by a 12-volt receiver and a 12-volt transmitter that can be recharged from the mains or an emergency vehicle.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句