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"Even though I'm tired sometimes because of the long distance, I enjoy cleaning the environment of the Great Wall and telling visitors of the importance of protecting a world heritage relic," he said.

"Declining transactions, tightened regulations and punishment over unauthorized agents' behavior are the major reasons behind a batch of real estate agents shutting down," said Zhang Dawei, chief analyst with Centaline Property.

"Due to the enthusiastic response, we launched registration for the third expo in August, and have already received many inquiries and reservations," said Zhou Lingyan, deputy general manager of the CIIE exhibition department of the National Exhibition and Convention Center (Shanghai).

"Do not forget that in the past all unmanned warehouses in the world were B2B, which meant there were only very limited orders each day," said Liu. He added that there is not a single person in the Shanghai warehouse and it is 100 percent managed by robots and AI.

"Every year, we train about 2,000 workers for our clients, so they can make better use of robots," Qian said.