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"Every time I express my belief that sex education should begin at primary school level, many of my friends are stunned, almost open mouthed. They say 'Oh, my goodness! How can we allow these innocent kids to learn about sex?'" said Li Ming, a sex education teacher at Xingzhi Primary School in the Beijing's Daxing district.

"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.

"Despite the broadly positive picture there are several forces that could impact future investment trends negatively," said Ndeloa.

"Despite growing public participation in exercise, the lack of awareness that this is a science, not just a habit, is taking a toll on exercisers' efforts and even causing serious harm now and then," said Tian Ye, a sports physiology professor at Beijing Sport University and head of the group that compiled the report.

"Facing this situation, I decided to play the 'bad guy'," Zhang said. "No one can get away from me by asking for a favor or trading with me."