一台活塞式发动机被充其量说只成为有效率33%。

A piston engine is said at best to be only 33% efficient.

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其次，针对摆动活塞式发动机的总体结构进行设计。

Next, in view of swings the piston engine overall structure to carry on the design.

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其次，针对摆动活塞式发动机的总体结构进行设计。

Next, in view of swings the piston engine overall structure to carry on the design.

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