NO.1：erode
erode: the object wears away and disappears/gets smaller (the river erodes the rock until it is just sand)侵蝕：物體磨損並消失/變小（河流侵蝕岩石直到它變成沙）。
For something to erode away, it does so by natural causes (such as the edge of a cliff gradually falls off due to wind, etc). 對於要侵蝕的東西，它是由自然原因造成的（例如懸崖的邊緣因風而逐漸脫落等）。
Erode means in the process of disappearing, it may not have completely disappeared but it will eventually in its current state.侵蝕意味著在消失的過程中，它可能並沒有完全消失，但一直處於目前的狀態它最終會消失。
Erode can be used when talking about land. Water will erode the banks of a river over time and become wider.侵蝕可用於談論土地。例：隨著時間的推移，水會侵蝕河岸並變得更寬。
NO.2：corrode
Corrode typically refers to a chemical reaction where an object disintegrates. (e.g. rust, acidic materials, etc.)腐蝕通常是指物質分解的化學反應。（如鐵鏽、酸性物質等）。
corrode: damages the surface but does not destroy (the acid rain corroded the metal on the roof and turned it rust colored)腐蝕：損壞表面但不破壞（酸雨腐蝕了屋頂上的金屬並使其生鏽）。
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