I bought a flying sword thermos recently, and I want to use it to make tea? But friends say that thermos bottles can't be used to make tea. Is it true?/You don't say.

The heat preservation time of the thermos cup is long and the heat dissipation speed is slow. Because of this feature, the extraction rate of tea juice is high. It is suitable for tea that is not easy to leach quickly, but it is not suitable for brewing delicate tea and should not be stored at high temperature for too long, otherwise it will have a stuffy taste. Nowadays, most people use thermos cups to make many things, such as tea and juice, but it is best to fill them with water.