土石被自然力磨掉
這一家就是核心畫面本身：實體的地表被水、風、浪一層層帶走。
wearing away (rock) · noun · C1
The process by which rock or soil is slowly worn away and destroyed by wind, rain, or the sea.
侵蝕
核心畫面
One way to picture it: water, wind or touching the same surface over and over, taking away a tiny amount each time. No single moment does much damage, but come back years later and a whole cliff face is gone.
風、雨、海浪一次又一次刷過同一個表面，每一次只帶走薄薄的一層。你當下看不出任何變化，但幾年後回來，整片崖壁已經退了好…更多收起
風、雨、海浪一次又一次刷過同一個表面，每一次只帶走薄薄的一層。你當下看不出任何變化，但幾年後回來，整片崖壁已經退了好幾公尺。重點不在某一次的力量有多強，而在於「一直磨、一直帶走一點」這個持續的動作。From the word’s history
From Latin ērōsiō, "a gnawing away," from ērōdō (ē- "away" + rōdō "to gnaw") — the same rōdō behind rodent. The old picture is literally teeth: something small biting at a surface again and again until it is eaten through.
來自拉丁文 ērōsiō「啃咬掉」，由 ērōdō（ē- 去掉 + rōdō 啃）而來；rōdō 也就是 rodent（囓齒動物）的那個字根。所以這個字最古老的畫面其實是「牙齒」——一個小東西不停地啃同一個地方，直到啃穿。這正好解釋了現代 erosion 為什麼強調「慢慢地、一點一點地被吃掉」，而不是一次崩壞。
Wiktionary ("erosion", from Middle French erosion, Latin ērōsiō, from ērōdō); Latin rōdō "to gnaw" also gives rodent
Two branches
抽象事物被慢慢削掉
把崖壁換成信任、自由、支持度——動作完全一樣：不是被一刀砍斷，而是被一次次小事磨薄。
gradual weakening · noun · C1
The process by which something is slowly reduced or destroyed, such as trust, freedom, or support.
削弱
原始詞典資料8 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
erosionnoun/ɪˈɹəʊʒən/
- 1
The result of having been worn away or eroded, as by a glacier on rock or the sea on a cliff face.
- Father Ted: The cliffs were gone? How could they just disappear? Dougal: Erosion.
- Even second-generation biofuels, made from crop wastes or wood, are an environmental disaster, either extending the cultivated area or removing the straw and stovers which protect the soil from erosion and keep carbon and nutrients in the ground.
- 2
The changing of a surface by mechanical action, friction, thermal expansion contraction, or impact.
- 3
The gradual loss of something as a result of an ongoing process.
- the erosion of a person's trust
- trademark erosion, caused by everyday use of the trademarked term
- 4
Destruction by abrasive action of fluids.
- 5
mathematicssciencesOne of two fundamental operations in morphological image processing from which all other morphological operations are derived.
- 6
dentistrymedicinesciencesLoss of tooth enamel due to non-bacteriogenic chemical processes.
- 7
medicinesciencesA shallow ulceration or lesion, usually involving skin or epithelial tissue.
- 8
mathematicssciencesIn morphology, a basic operation (denoted ⊖); see Erosion (morphology).
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。