To change something so it doesn't work the way it should anymore, like making a protein or DNA not do its job.
High heat can denature the proteins in our food.
高溫可以使我們食物中的蛋白質變性。
To take the alcohol out of a drink, usually by adding something that makes the alcohol go away.
They denatured the alcohol to make it undrinkable and avoid paying taxes.
他們使酒精變性,使其不能飲用,以避免繳稅。