For an engine to operate correctly, air must flow into and out of the engine without restriction.

为了使得发动机正常运转，空气必须无阻碍地进出发动机。

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For an engine to operate correctly, air must flow into and out of the engine without restriction.

为了使得发动机正常运转，空气必须无阻碍地进出发动机。

youdao