Une idée qui explique pourquoi quelque chose se produit.
An idea that explains why something happens.
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See how the word “une théorie” is used in sentences
Des scientifiques ont proposé une théorie sur les débuts de la vie. — Scientists proposed a theory about how life began.
J'ai une théorie sur la raison pour laquelle la machine n'arrête pas de s'arrêter. — I have a theory about why the machine keeps stopping.
Ça reste une théorie tant que personne ne l'a testée. — That stays a theory until somebody tests it.
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