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1.The DC lubricating-oil pump is used to lubricate the engine's moving parts.
直流润滑油泵用于给发动机的移动部件润滑。
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2.The engineer replaced the DC lubricating-oil pump with a new one.
工程师用一个新的直流润滑油泵替换了旧的。
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3.The DC lubricating-oil pump was designed to improve efficiency and reduce maintenance costs.
直流润滑油泵的设计旨在提高效率并减少维护成本。