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A keystone is the stone placed right at the top center of an arch — the last stone put in when building it, and the one that holds all the other stones in place; remove it, and the whole arch falls down. From this image, "keystone" is also used figuratively for something that everything else depends on — the most essential, central part of a plan, idea, or system. You might read about "the keystone of the company's strategy," meaning the one idea everything else is built around.
(建築)拱心石；(比喻)基石、關鍵要素
組成"Key" (essential/central) plus "stone" — literally "the essential stone."
原始詞典資料10 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。
Keystonename
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A census-designated place in Colorado.
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A city and town in Iowa.
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A ghost town in North Dakota.
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A town in South Dakota.
keystonenoun/ˈkiː.stəʊn/
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architectureThe top stone of an arch.
- The tunnel, which is 1,000 yd. long, had been closed to passenger traffic since November 17, 1949, after some of the keystones had worked loose.
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Something on which other things depend for support.
- Tension between empirical and theoretical knowledge is keystone to sociological and to organizational theories, as early as in Marx's and Weber's frameworks.
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businesscommerceretailA retail price that is double the cost price; a markup of 100%.
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ball-gamesbaseballgamesThe combination of the shortstop and second baseman.
keystoneverb/ˈkiː.stəʊn/
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To distort (an image) by projecting it onto a surface at an angle, which for example causes a square to look like a trapezoid.
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businesscommerceretailTo double the cost price in order to determine the retail price; to apply a markup of 100%.
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。