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Cynthia Breazeal, professor of media arts and sciences, head of Personal Robots group, MIT.

Currently, China has about 217 million cars on the road, official data show. About 78 percent of them are owned by residents in first- and second-tier cities. But demand for used vehicles chiefly comes from consumers in small cities, resulting in huge demand-supply imbalances geographically, according to data from Youxin, another online used car dealer.

Customers buy foods in a supermarket in Mujie village, Guizhou province, on Nov 25, 2020. [Photo/Xinhua]

Cui was quoted as saying the company had made use of people's fear of cataract surgery by misleading them to believe that the disease can be cured without surgery.

Customers could order self-driving taxis through a ride-hailing app, and during the test period, the cab will have a "safety officer" in the driver's seat, said Wang Jing, founder and CEO of JingChi.