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"Every year, our farm needs about 4,000 workers to plant rice seedlings. Most of them are hired from areas outside the plain," said Zhang Lei, head of the farm's publicity department. "Although mechanized agriculture has greatly increased in recent years, lots of work still relies heavily on manual labor, such as transporting rice seedlings, placing them on paddy transplanters and working in the areas that the machines can't reach."

"Drones are over 10 times more efficient than skilled manpower and they are cost-effective and environmentally friendly," said Li Liping, a major grain grower in the county-level city of Xiangxiang in Central China's Hunan province.

"Essilor and Tencent share the same dedication to improving the current state of vision health in China through public education and innovation," said Arnaud Ribadeau Dumas, president of Essilor Greater China and the Global Instruments Division.

"Energy costs totaling 17.7 billion yuan have been reduced for enterprises since 2016," he said.

"Dalian's strategic location, deep-water port facilities, international reputation and excellent operation and management track record have provided a very good foundation for port development and cooperation with Vale," he said.