NO.1：erode
erode: the object wears away and disappears/gets smaller (the river erodes the rock until it is just sand)侵蚀：物体磨损并消失/变小（河流侵蚀岩石直到它变成沙）。
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). 对于要侵蚀的东西，它是由自然原因造成的（例如悬崖的边缘因风而逐渐脱落等）。
Erode means in the process of disappearing, it may not have completely disappeared but it will eventually in its current state.侵蚀意味着在消失的过程中，它可能并没有完全消失，但一直处于目前的状态它最终会消失。
Erode can be used when talking about land. Water will erode the banks of a river over time and become wider.侵蚀可用于谈论土地。例：随着时间的推移，水会侵蚀河岸并变得更宽。
NO.2：corrode
Corrode typically refers to a chemical reaction where an object disintegrates. (e.g. rust, acidic materials, etc.)腐蚀通常是指物质分解的化学反应。（如铁锈、酸性物质等）。
corrode: damages the surface but does not destroy (the acid rain corroded the metal on the roof and turned it rust colored)腐蚀：损坏表面但不破坏（酸雨腐蚀了屋顶上的金属并使其生锈）。