When high-speed train runs in the environment with a large number of airborne particles. these particles may accumulate on the bogie of the train. which will further challenge the normal operation of the bogie and reduce the riding comfort and train safety. In order to prevent particles entering into the bogie area. https://fjphdyo3xh8vq.nizarblog.com/35079695/movables-for-immovable-stories-re-animating-children-s-classics-with-hypermediated-paper-engineering