他们改用活塞发动机。

They use a piston engine instead.

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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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活塞是影响发动机性能的关键零件。

Piston is the key part that affects the performance of a engine.

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发动机在运转时，气门、活塞各遵循一定的规律。

When engine is running, the valve and piston moves according to a certain rule.

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活塞一词是指汽车发动机的关键部件。

The name "Pistons" refers to a key part of an automobile engine.

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活塞环是汽车发动机的关键零件。

The piston ring is a key part of automobile engine.

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活塞环是汽车发动机的关键零件。

The piston ring is a key part of automobile engine.

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