Oil is essential to an engine for it to function properly.

机油对引擎的正常运转是很重要的。

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The engine parts will wear down if not properly cared for.

若未妥善照料，引擎的部分将会被磨损。

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The engine is running properly.

发动机运转情况良好。

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The engine is running properly.

发动机运转情况良好。

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