PHRASAL VERB-ERG (使)磨损;(使)磨薄 If you wear something away or if it wears away, it becomes thin and eventually disappears because it is used a lot or rubbed a lot. (使)磨损;(使)磨薄 [Also VERB n PREPOSITION]
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It had a saddle with springs sticking out, which wore away the seat of my pants. [VERB PREP. noun]
鞍座上的弹簧翘出来，把我裤子臀部那块磨破了。
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The softer rock wears away. [VERB PREP.]
硬度较低的石头磨光滑了。