Hello, I used to work in McDonald's. McDonald's employees always remind customers when they buy hot drinks such as hot coffee and hot black tea. The general language expression is "Hot drinks burn your mouth, please don't use straws". In addition, coffee is usually equipped with a stirring rod, which can be regarded as a double tube. Hollow is the use of less material. This is not a straw. You can't use straws for hot drinks. The customer has been prompted on the cup or at the front desk. Please don't use a straw when drinking hot drinks. So as not to burn your throat, especially children!