Идея, объясняющая, почему что-то происходит.
An idea that explains why something happens.
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See how the word “теория” is used in sentences
Учёные предложили теорию о том, как зародилась жизнь. — Scientists proposed a theory about how life began.
У меня есть теория, почему машина всё время останавливается. — I have a theory about why the machine keeps stopping.
Это останется теорией, пока кто-нибудь её не проверит. — That stays a theory until somebody tests it.
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