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Difficulty in movement is one of old peoples agonies when they are getting older and older day by day. Sometimes, standing up from a chair which they have just rest in would cost the old people a great effort. This chair is just prepared for them. It doesnt need external force or machinery aid. According to the movement of gravity center when the old people stand up, the chair would just give up towards force to them by lifting up the chair, thus help them to stand up.
Kuan Cheng； Chuan Cao； Longdi Sun； Yijun Zhao；