Most automobile engines operate on a four stroke cycle.

大多数发动机为四行程发动机。

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The four-stroke cycle which is in common use.

这就是常用的四冲程循环。

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This is the four-stroke cycle which is in common use.

这就是常用的四冲程循环。

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This is the four-stroke cycle which is in common use.

这就是常用的四冲程循环。

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