Uma ideia que explica porque é que algo acontece.
An idea that explains why something happens.
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See how the word “uma teoria” is used in sentences
Os cientistas propuseram uma teoria sobre como a vida começou. — Scientists proposed a theory about how life began.
Tenho uma teoria sobre porque é que a máquina não para de parar. — I have a theory about why the machine keeps stopping.
Isso continua a ser uma teoria até alguém a testar. — That stays a theory until somebody tests it.
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