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"For smartphones, only the charging port and SIM card port are made of metal components that can be detected and attracted by a magnet," he said. "It requires patience, experience and skill to pull them out."

"Generations of workers have not only created the miracle of turning barren land into a forest but also a precious spiritual fortune, the Saihanba spirit, which should be learned and carried forward," Liu said.

"From going through the data sets Twitter has released, it doesn't seem like [Twitter] was particularly precise. Some of it seems to have little or no connection to the protests," Elise Thomas of Australia's International Cyber Policy Center, a think tank which studies misinformation around the world, said in an email to the BBC.

"Great Wall is poised to improve its annual sales volume for pickups from about 120,000 units to 200,000 units by 2020 and forge itself into China's first pickup brand as well as one of the world's top three," Ning said.

"For instance, we've accumulated massive experience in leveraging the digital economy for the development of remote learning, online shopping and 5G networks that can be shared with the rest of the world through the BRI," Wang said.