He Yong lubricates the bearing of a wooden bicycle in Liuhu Township of Pingliang City, northwest China's Gansu Province, Aug. 14, 2018. The 55-year-old farmer He Yong successfully made a 1.8-meter-long and 0.98-meter-high wooden bicycle in 2017. The bike was made purely of wood, including walnut and elm. (Xinhua/Fan Peishen)