air-compressor crank shaft

例句：

1. 1. The air-compressor is essential for the operation ofour factory.
   空气压缩机是我们工厂运营所必需的。
2. 2.The air-compressor was used topump water from the well.
   空气压缩机被用来从井里抽水。
3. 3. The air-compressor is responsible for maintaining thepressure in the pipeline.
   空气压缩机负责保持管道中的压力。