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We always have no idea of the temperature of the drinking water, thus, we easily get our mouth burned,especially the kids and the old. This kind of red- green cup takes advantage of the association between temperature and color. The loop at the bottom of the cup turns red when the water is hot. Since the red color is distinct from the original green color, which can be regarded as a warning. But when the temperature drops to a appropriate degree, the loop will turn green, which is in line with the rest color. This kind of cup presents concisely the best time for us to drink the boiling water, which can avoid our tongue being scalded.