To lubricate or sleek means to apply lubricant between moving parts to reduce friction and wear.
润滑是指在运动部件之间涂抹润滑剂，以减少摩擦和磨损。
| Chinese | 润滑 |
|---|---|
| English | to lubricate, smooth, sleek, oily |
| Pinyin | run4 hua2 |
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