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Depletion is the noun: the process, or the result, of reducing how much of something is there until much less remains. We talk about the depletion of savings, of groundwater, of fish stocks, of the ozone layer. News and science like this word; at the dinner table people more often say “we’re running out” or “it’s used up”. Though actually, depletion names the itself, not the thing that is — so we say “depletion of oil”, not “the oil is a depletion”. It can be slow (soil depletion over decades) or fast (a weekend of spending that leaves a sharp depletion in your account).
耗盡、枯竭、耗損（如臭氧層耗損；指過程或結果，不是那件物品本身）
組成Borrowed from Latin depletio, depletionem, from depleō — the noun built on the same root as deplete. The ending -ion turns the action into a thing you can name.
同家族的字
- depletethe verb this noun is built from
原始詞典資料4 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。
depletionnoun/dɪˈpliːʃən/
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The act of depleting, or the state of being depleted; exhaustion.
- The Great Northern 4-4-0s have all vanished, and there has been some depletion in the ranks of North British "Glens" and "Scotts."
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The consumption of a resource faster than it can be replenished.
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archaicmedicinesciencesThe act of relieving congestion or plethora, by purging, blood-letting, or reduction of the system by abstinence.
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accountingbusinessfinancegradual expense or use of natural resources over time.
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。