This aerial photo shows an automatic hub production line of a leading motorcycle wheel hub manufacturing enterprise in Dianjiang County of Chongqing, southwest China, Nov. 28, 2023. Chongqing is one of the important production and export bases of motorcycle parts in China. In recent years, Dianjiang County of Chongqing has guided local leading motorcycle wheel hub production enterprises to rely on scientific and technological innovations to promote industrial upgrading.