free-piston compressor

例句：

1. 1.The free-piston compressor is a type of engine that uses a piston to move air through the engine.
   自由活塞压缩机是一种使用活塞将空气通过发动机的发动机类型。
2. 2. In this case, the free-piston compressor was used to increase the efficiency of the gas turbine.
   在这种情况下，自由活塞压缩机被用来提高燃气轮机的效率。
3. 3. The free-piston compressor has been widely used in various industries due to its high efficiency and low noiselevels.
   由于其高效率和低噪音水平，自由活塞压缩机已被广泛应用于各种行业。