Tea, carbonated drinks and fruit juice, milk and soybean milk are not recommended to be put in a thermos cup. The National Health Commission pointed out that it is not recommended to make tea with insulated cups because tea is usually suitable for brewing. Soaking in hot water for a long time will destroy the vitamins in tea and reduce the flavor and taste of tea. Moreover, if the cleaning is not timely and thorough after making tea, tea scale will be attached to the inner tank of the thermos...