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"China looks forward to a full exchange of views on our future cooperation plans," he said.

"But when the weather doesn't allow him to go out, he would become depressed and restless."

"Carrying massive customer data, mobile ads (tailored to each and every customer) can capture demand better than traditional ads, increasing the media investment efficiency," said Leo Chiang, principal with consultancy PwC Strategy&.

"China is the most promising helicopter market in the world. We will introduce more models to the market," she said.

"But we're more concerned about the use of the app, particularly cellphone location data to conduct that kind of contact tracing because that type of information can be so incredibly sensitive and invasive and so easy to abuse."