斜面和台阶上的各控制件布局合理且形状各异，方便儿童操作，手感舒适。
All the control units on the inclined face and the convex step are reasonable in allocation and variable in shape, which provides easy operation and comfortable hand feeling to children.
卡环是一具有开口部的环形体，环形体的内侧设置一圈用于扣压轮芯的台阶，台阶表面具有向下倾斜的弧面形状。
The snap ring is a ring with opening part, the inside of the ring is arranged with a circle of step which is used to buckle the wheel core, and the surface of the step has downward inclined arc shape.
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