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TOEFL BNC: 33446 COCA: 21226

lubrication

noun
/ˌluːbrɪˈkeɪʃn/
/ˌluːbrɪˈkeɪʃn/
[uncountable]
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  1. the act or process of putting a lubricant on something such as the parts of a machine, to help them move smoothly给…上润滑油;上油

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