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Free angle is designed for solving the problem of drinking up.The opening part can be arbitrarily bent so that it looks like a soft neck. When you need to drink, as long as you view the mouth rightly without drinking up.
University of South China
Hengyang, China
Ding Guoquan,
University of South China
Xin Ge,
University of South China
Ai Danqing,
University of South China
