clé de voûte

la clé de voûte
A noun phrase is a group of words that acts like a noun in a sentence or phrase (e.g., un je ne sais quoi).
noun phrase
a. keystone
La clé de voûte de la cathédrale se trouve au centre de la voûte, là où le blason royal est bien visible.The cathedral's keystone is located at the center of the vault where the royal coat of arms is clearly visible.
2.
A phrase used as a figure of speech or a word that is symbolic in meaning (e.g., to pull someone's leg).
(figurative)
(key element)
a. cornerstone
Le chercheur dit que la clé de voûte de l'intelligence artificielle est la collection de données précises.The researcher says that the cornerstone of artificial intelligence is the collection of accurate data.
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