Using biserial roller axletree with centripetal spherical support of the host axletree can reduce energy consumption by 30%. 主轴承受用双列向心还球面滚子轴承，可降低能耗30%25。
Use U form and L form ambry, facilitating wheelchair turns, act distance is short, when use biserial ambry, the two span between the row should assure the whirl of wheelchair. 使用U形和L形橱柜，便于轮椅转弯，行径距离短，使用双列型橱柜时，两列间间距应保证轮椅的旋转。
Can pass biserial exhaust duct fresh air inside inspiratory shoe, achieve convection result, make Gan Shuang maintains inside shoe antrum, dress is comfortable can prevent fungus to multiply. 2. 可通过双列排气道将新鲜空气吸入鞋内，达到对流效果，使鞋腔内保持干爽，穿着舒适并可防真菌繁衍。
