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The ring cup is used to remind people of be careful to drink hot water. There is a circle, in the middle of the cup body, made by special material that can change colour as the water temperature changes. When the water temperature is hot, the circle is non-transparent. When the circle turns to be transparent, it indicates that the water is cooling down and suitable to drink.
Ying Fangtian,Zhao Xiaoliang，Sang Yilei,Xue Mengru