rub
scrub
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→mo2ca1 • mócā
friction
rubbing, rub, to rub
鞋子 和 地板 之间 有 摩擦。
There is friction between the shoes and the floor.
他们 之间 发生 了 摩擦。
There was friction between them.
摩擦 会 产生 热量。
Friction generates heat.