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It always upsets girls which they are not strong enough to open a LockLock filled of hot water. It is a airtight cup with an air vent,which designed for girls. Push the button on the cover before open it, and atmospheric pressure will be balanced inside and outside. In this way, open the top of cups is just a piece of cake.
Zhejiang University of Technology
Xingyue wang Jinglu li Yizhi zhuang Yuanzhong zhang