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To increase the sensitivity of pouring water for the blinds,the cup can make you
sense that the water is no full to avoid water to overflow.
There is a strucuter named staggered fold in the 1/3 part of the cup.The staggered
foldinside would fall down when the water reached a certain height or weight
because of the gravity,and accompanied with a sound "Ka".
The remarkable sign conveys a correct massage for blinds with the sense of hearing
Zhen Zhang Ziyi Yuan