The engine lubrication system supplies oil to all the friction surfaces between the engine moving parts.发动机润滑系统给发动机运动部分的摩擦表面提供润滑油。

If the lubrication system did not supply these moving components with oil,friction would quickly destroy these surfaces.如果润滑系统不给运动部件提供润滑油的话，摩擦会很快损坏这些表面。

The oil reduces friction between moving components,which increases engine power and efficiency.润滑油减少运动部件表面摩擦，增加了发动机的功率和效率。

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