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Usual dissposable cups pour water momentum wreckling .like this.
Now.open several ports in the bottom of the cup. gently pressed around there will be a few supporting surface to prevent cup dumping.
East china jiao tong university
Nanchang city, China
East china jiaotong university
nanchang jiangxi, China
Junbin Liu Wenyu Hu Yuecen Han Shuai Zhang