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When people take the escalator in the supermarket, and it's going down, their ankles and knees will become deformed. For those women who wear high-heeled shoes, it's an espeacially painful thing .XX is a shopping trolley designed for women who wear high heels. There is a board on the trolly which can rotate for a certain angle .When you are not on the escalator, it can be flipped up for not disturbing the normal use. When you are going down on the escalator, you can rotate the board to a certain angle and step on it to release the pain of the feet.
Qize Song Hao Qin Jinchi Che Zhiliang Zhen