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

活塞是影响发动机性能的关键零件。

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The piston ring is a key part of automobile engine.

活塞环是汽车发动机的关键零件。

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The port valve is a key part in a piston pump.

配流阀是柱塞泵中十分重要的元件。

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The port valve is a key part in a piston pump.

配流阀是柱塞泵中十分重要的元件。

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