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The solid rock deep under the soil that everything else - dirt, water, buildings - sits on top of. People also use it for the most basic, most important idea that everything else in a plan, belief, or relationship is built on: 'the bedrock of their friendship.'
(地質)基岩；(比喻)根基、基礎
組成bed (a supporting base, like the bed of a river) + rock
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。
bedrocknoun/ˈbɛd.ɹɒk/
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businessconstructionengineeringThe solid rock found at some depth below the ground surface.
- The denudation of the land was upon a grand scale. All superficial accumulations were swept away, and the bedrock was exposed.
- Listen! It's big. Only eight to twenty feet to bedrock. There won't be a claim that don't run to half a million.
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A basis or foundation.
- If culture is the bedrock of a society, then language is the cornerstone of culture.
- Now, although like most young people, Godfrey was indolent and evasive of difficulties, fearful of facing troubles also, he had a bedrock of character.
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The bones.
bedrockverb/ˈbɛd.ɹɒk/
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To establish on a solid foundation.
- Bedrocked in the formative race relations of the Heart of Dixie, the governor declined an invitation to the unveiling of artist Maya Lin's civil rights memorial in downtown Montgomery.
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。