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"Given most of our users are adults who have limited time for learning each day, we are scrambling to leverage more technologies to fill up their excess time," said Liu.

"From startups to cultivating land, our village has got rid of poverty and now is on a road of common prosperity," Zhang Yubiao, party chief of Nanling village, said proudly.

"Harper is working closely with the relevant authorities, such as the Community Agriculture Alliance, and others to enable trials involving drones for the first time in the country," Heeks said.

"Going forward, we are planning to set up clinic chains with standardized, high-quality services, in smaller cities as such places still lack the facilities, even though there is a growing need for them," Jin said.

"Fine ashfall can cause irritation and breathing problems, especially among the elderly and children, and it is particularly dangerous to the health," the institute warned. In addition, it said that "areas of ashfall have also an experienced sulfurous smell, which can also cause irritation".