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Cao Yin, the managing director of the Digital Renaissance Foundation, added: "Now most blockchain developers are still focusing on underlying technologies, and thus we need more application developers to work in the industry."

Chairs sit in social distancing circles because of the coronavirus disease (COVID-19) pandemic awaiting the arrival of attendees at US Democratic presidential nominee Joe Biden's 2020 US presidential election night rally in Wilmington, Delaware, US, November 3, 2020. [Photo/Agencies]

Chapman said that the boom had been so profound that growers were now facing waiting lists of up to four years to get citrus trees from nurseries.

Carrying wooden oars and deflated sheepskins, his father led a team upstream for more than 30 km. Once they had purchased their goods, they assembled the sheepskin rafts and drifted downstream. "It took one day for my father to tramp over the hills and get there, and another day to drift back home," Tong recalled.

Chao bikes, which are painted yellow and black, have been appearing in Beijing, Tianjin and Shanghai over the past three months. Each carries a notice in Chinese saying "prohibited from riding on the road".