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.
高温可以使我们食物中的蛋白质变性。
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.
他们使酒精变性,使其不能饮用,以避免缴税。