generator of an Abelian group

例句：

1. 1. The new software is a generator of efficiency and productivity.
   这款新软件是提高效率和生产力的源泉。
2. 2.The scientist used a generator to power the lab.
   科学家使用发电机为实验室供电。
3. 3. The generator was responsible for providing electricity to the city.
   发电机负责向城市提供电力。