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When using cups, we will look into the cup to see if it is empty. But the blinded is not able to tell and know how much is left in the mug. So a soft plastic material is used to be the marker and when the level reaches the mark, the plastic will expand outward for user to know the level of liquid in the mug.
LEE, CHUN-YAO Yi-Xuan , Zhou LIN, Yen-ju Jheng-You,You