alternating-current system的用法和样例：
例句
- In favor of this system are its simplicity and its saving with respect to other AC systems.
与其它交流系统相比，这系统的优点是它的简单和节约。 - With the transformer, the ability to transmit power at high voltage with corresponding lower current and lower line-voltage drops made ac more attractive than dc.
变压器使得电能可以在更高电压和更低电流传输，降低了线路电压降，使交流系统比直流系统跟具吸引力。
