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1.The lubricating pits on the surface of the machine are designed to reduce friction and improve efficiency.
机器表面的润滑坑设计用来减少摩擦并提高效率。
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2.The oil well is filled with a lubricating pit, which helps to prevent wear and tear.
油井里充满了一个润滑坑，这有助于防止磨损。
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3.The engineer carefully inspected the lubricating pits on the gearbox, ensuring they were in good condition.
工程师仔细检查了齿轮箱上的润滑坑，确保它们处于良好状态。