electromagnetic marine proportional control valves

例句：

1. 1. The device is designed to operatein an electromagnetic field.
   该设备设计用于在电磁场中运行。
2. 2. The scientistused an electromagnetic wave to communicate withthe aliens.
   科学家使用电磁波与外星人进行通信。
3. 3. The magnetized iron rodacts as a transformer, convertingelectrical energy into magnetic energy.
   磁化的铁棒作为变压器，将电能转换为磁能。