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The fruit shop which sell watermelon, need cut many watermelon. Since the watermelon rind is too thick, we need cut out it by press the back of knife heavily, it will cause the hand hurt. If using new design, can take out the blue rubber cover which hide in the knife as following image, the it will protect your hand.
SouthChina University of Technology
Guangzhou, China
Hongchao Zhou,
South China University of Technology
Jun Sun,
South China University of Technology
Xiang Liu,
South China University of Technology