arc dynamo

例句：

1. 1.The arc dynamo is theheart of the power station.
   直流发电机是发电厂的核心。
2. 2. The arc dynamo was used to generate electricity for thecity's grid.
   直流发电机被用来为城市的电网提供电力。
3. 3. Thearc dynamowas a critical component in thedesign of the new power plant.
   直流发电机是新发电厂设计中的关键部件。