the part that is left after the main part has gone or been taken away, or a substance that remains after a chemical process such as evaporation

She cut off the best meat and threw away the residue. 她切下最好的肉，把剩下的扔掉了。

The white residue in/on the kettle is a result of minerals in the water. 壶中／上白色的渣子是水中的矿物质沉淀。

the part of a dead person's money and property that is left after taxes, debts, etc. have been paid

The residue (of the estate) went to her granddaughter. 剩余遗产由她的孙女继承。