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لغت ١١ درس ١٨ کتاب ۵٠۴ …………………………………. Lubricate / ‘luːbrɪkeɪt / make (machinery) smooth and easy to work by putting on oil, grease, or a similar substance The bulky* wheels of a railroad train must be lubricated each week. A large quantity* of grease is needed to lubricate an airplane engine. When an engine is lubricated, it works much better.. با …
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