An employee works at a flower trade center in Lanzhou New Area, Lanzhou, northwest China's Gansu Province, Dec. 8, 2020. In recent years, through soilless culture, automatic intelligent control, harmless treatment of manure and other technological means, a modern circular agriculture system has been formed in Lanzhou New Area to realize green development and boost the income of local villagers. (Xinhua/Chen Bin)

Employees work at a modern agricultural demonstration garden in Lanzhou New Area, Lanzhou, northwest China's Gansu Province, Dec. 8, 2020. In recent years, through soilless culture, automatic intelligent control, harmless treatment of manure and other technological means, a modern circular agriculture system has been formed in Lanzhou New Area to realize green development and boost the income of local villagers. (Xinhua/Chen Bin)

An employee works at a modern agricultural demonstration garden in Lanzhou New Area, Lanzhou, northwest China's Gansu Province, Dec. 8, 2020. In recent years, through soilless culture, automatic intelligent control, harmless treatment of manure and other technological means, a modern circular agriculture system has been formed in Lanzhou New Area to realize green development and boost the income of local villagers. (Xinhua/Chen Bin)

Employees work at a modern agricultural demonstration garden in Lanzhou New Area, Lanzhou, northwest China's Gansu Province, Dec. 8, 2020. In recent years, through soilless culture, automatic intelligent control, harmless treatment of manure and other technological means, a modern circular agriculture system has been formed in Lanzhou New Area to realize green development and boost the income of local villagers. (Xinhua/Chen Bin)

An employee works at a modern agricultural demonstration garden in Lanzhou New Area, Lanzhou, northwest China's Gansu Province, Dec. 8, 2020. In recent years, through soilless culture, automatic intelligent control, harmless treatment of manure and other technological means, a modern circular agriculture system has been formed in Lanzhou New Area to realize green development and boost the income of local villagers. (Xinhua/Chen Bin)

Employees work at a modern agricultural demonstration garden in Lanzhou New Area, Lanzhou, northwest China's Gansu Province, Dec. 8, 2020. In recent years, through soilless culture, automatic intelligent control, harmless treatment of manure and other technological means, a modern circular agriculture system has been formed in Lanzhou New Area to realize green development and boost the income of local villagers. (Xinhua/Chen Bin)

An employee works at a modern agricultural demonstration garden in Lanzhou New Area, Lanzhou, northwest China's Gansu Province, Dec. 8, 2020. In recent years, through soilless culture, automatic intelligent control, harmless treatment of manure and other technological means, a modern circular agriculture system has been formed in Lanzhou New Area to realize green development and boost the income of local villagers. (Xinhua/Chen Bin)

An employee works at a modern agricultural demonstration garden in Lanzhou New Area, Lanzhou, northwest China's Gansu Province, Dec. 8, 2020. In recent years, through soilless culture, automatic intelligent control, harmless treatment of manure and other technological means, a modern circular agriculture system has been formed in Lanzhou New Area to realize green development and boost the income of local villagers. (Xinhua/Chen Bin)