bedrock (noun)
基岩是土壤下方的坚硬岩石。比喻意义上，它指代事物的基础或根本原则。
"The construction crew had to drill through ten meters of soil before they reached the bedrock."
Think of a 'bed' made of 'rock'. It is the very bottom layer where the Earth sleeps. It never moves and is the strongest...
Using 'bedrock' to mean 'the very top'. → Using 'keystone' or 'pinnacle'.
Writing it as two words: 'bed rock'. → bedrock
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