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"DJI cannot share customer data it never receives," the company said, after explaining that the data stays solely on the drone and on the pilot's mobile device.

"Ensuring 24-hour monitoring over all such vessels will greatly reduce the chances of vessels fishing across boundaries driven by economic benefits and prevent related diplomatic incidents from occurring," Lin said.

"Every reputable health institution says wearing a mask is one of the most effective things people can do to protect others from contracting COVID-19, especially in places like an aircraft, where social distancing is a challenge," Toby Enqvist, United's chief customer officer, said in a statement.

"Exhibiting last year allowed us to interact with professionals and potential clients from different sectors. The fair helped us enhance brand awareness not only in China, but also in other Asian countries," she said.

"Dogs can hear high-frequency sounds that humans can't. By using such sounds, police can give the animals orders in situations in which they don't want to be heard, or from long distances," said Xu, a trainer at a police dog training base in suburban Beijing that is home to about 270 dogs.