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1. The free piston engine is a type of internal combustion engine that uses a piston to movethe cylinder walls.
自由活塞发动机是一种内燃机，它使用活塞来移动气缸壁。
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2. Free piston engines are often used in aircraft and marine applications due to their high efficiency and reliability.
由于其高效率和可靠性，自由活塞发动机常用于航空和海事应用。
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3. The design of the free piston engine allows for more precise control over the engine's performance, making it ideal for applications requiring high levels of precision.
自由活塞发动机的设计允许对发动机性能进行更精确的控制，使其非常适合需要高精密度的应用。