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There exists terribly hidden danger for traditional plastic thermos as it needs to open a mouth from the bottom when the inner container is changed: the inner container is very likely to fall down because of the loosening botom,which makes the fragments and falling hot water hurt the users.In order to avoid this ,the safe thermos place the mouth on the top for changing the inner container,thus the users can safely use it at ease.
Xinyi He Lijuan Liu Lin Fu Xiaopu Jiang