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"Fetching water used to be a big headache. We had to travel to a faraway river to get water and even cut holes in the ice in winter. Then the small train sent water right to our doorsteps," said Li Zuopei, an 80-yearold resident of Yingbishan village.

"Even though I'm tired sometimes because of the long distance, I enjoy cleaning the environment of the Great Wall and telling visitors of the importance of protecting a world heritage relic," he said.

"Everybody is wearing a face mask."

"Each user in turn would be contributor of the more data to enlarge the data pool of the machine-assisted learning and assessment," he explained. "Bigger data, richer information."

"Facts speak louder than words. According to various information revealed in recent years, everyone is very clear about exactly who is carrying out large-scale tapping, monitoring, stealing of secrets and infiltration in other countries, and going to any length to maintain and exert their influence," Hua said.