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As the age of the people of the city more and more poor because the drip bottles and syrup are transparent, so the old man's infusion is always very difficult to see how much the number of medicine left.
Design of easy looking "is in the bottle a significant increase in the two blue lines and boundaries by the refractive index of liquid can clearly see the potion. Bring great convenience to the elderly visually impaired cognition.
Zhongyuan University of Technology