You can think of abrasion as one surface taking a layer off another by rubbing. Something hard and rough drags across something softer, and a little of the softer thing goes each time. The word can name that rubbing-away itself, or the bare place it leaves behind.
abrasion 可以想成「一個表面把另一個表面磨掉一層」。粗硬的東西擦過比較軟的東西，每擦一次就帶走一點。這個字既可以指「磨掉」這個過程，也可以指磨完之後露出來的那一塊。
From the word’s history
Wiktionary traces it to Medieval Latin abrasio, a scraping, from Latin abradere, to scrape off — so the scraping action, not the mark, is what the word originally named.
來源資料把它追到中世紀拉丁文 abrasio（刮這件事），來自拉丁文 abrādō（刮掉）。也就是說，這個字最早指的是「刮」這個動作，而不是刮出來的痕跡。
Wiktionary, "abrasion"
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