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In daily life,the cup on the table is easy to be broke.This design solves the occasional problem,using the principle of vacuum suction(similar China cupping)in a tight space at the bottom of the cup will reduce the pressure,and then placed on the desktop can be absorbed on the desktop,when need to pick up the only need to squeeze rubber can achieve the pressure balance,thus you can easily pick up.This would solve the table or other reasons caused slight shaking cup poured water onto the desktop problems.
Sang Yilei,Zhao Xiaoliang,Ying Fangtian,Ge Jin