In this aerial photo taken on April 20, 2019, farmers work in a field in Tianxin Village of Sitang Township, Lingui District, Guilin, south China's Guangxi Zhuang Autonomous Region. Guyu, literally meaning "Rain of Millet", is the sixth of the 24 solar terms created by ancient Chinese to carry out agricultural activities. For the year 2019, the day of Guyu falls on April 20. (Photos: Xinhua)

A farmer works in a field in Liangtian Village of Congjiang County, Qiandongnan Miao and Dong Autonomous Prefecture, southwest China's Guizhou Province, April 20, 2019. Guyu, literally meaning "Rain of Millet", is the sixth of the 24 solar terms created by ancient Chinese to carry out agricultural activities. For the year 2019, the day of Guyu falls on April 20.

In this aerial photo taken on April 20, 2019, farmers work in a field in Etang Township of Pinggui District, Hezhou, south China's Guangxi Zhuang Autonomous Region. Guyu, literally meaning "Rain of Millet", is the sixth of the 24 solar terms created by ancient Chinese to carry out agricultural activities. For the year 2019, the day of Guyu falls on April 20.

In this aerial photo taken on April 20, 2019, farmers work in a field in Chebei Village of Baogai Township, Hengnan County, Hengyang, central China's Hunan Province. Guyu, literally meaning "Rain of Millet", is the sixth of the 24 solar terms created by ancient Chinese to carry out agricultural activities. For the year 2019, the day of Guyu falls on April 20.

In this aerial photo taken on April 20, 2019, farmers work on a chrysanthemum planting base in Jinniu Township of Lujiang County, Hefei, east China's Anhui Province. Guyu, literally meaning "Rain of Millet", is the sixth of the 24 solar terms created by ancient Chinese to carry out agricultural activities. For the year 2019, the day of Guyu falls on April 20.

Villagers work in a terraced field in Jiabang Township of Congjiang County, southwest China's Guizhou Province, April 20, 2019. Guyu, literally meaning "Rain of Millet", is the sixth of the 24 solar terms created by ancient Chinese to carry out agricultural activities. For the year 2019, the day of Guyu falls on April 20.

(190420) -- YICHUN, April 20, 2019 (Xinhua) -- Farmers work in a field in Shagang Village of Shuikou Township, Jing'an County, Yichun, east China's Jiangxi Province, April 20, 2019. Guyu, literally meaning "Rain of Millet", is the sixth of the 24 solar terms created by ancient Chinese to carry out agricultural activities. For the year 2019, the day of Guyu falls on April 20.

Villagers work in a terraced field in Jiabang Township of Congjiang County, southwest China's Guizhou Province, April 20, 2019. Guyu, literally meaning "Rain of Millet", is the sixth of the 24 solar terms created by ancient Chinese to carry out agricultural activities. For the year 2019, the day of Guyu falls on April 20.

Farmers work in a field in Changtan Village of Taijiang County, southwest China's Guizhou Province, April 19, 2019. Guyu, literally meaning "Rain of Millet", is the sixth of the 24 solar terms created by ancient Chinese to carry out agricultural activities. For the year 2019, the day of Guyu falls on April 20.

Villagers work in a terraced field in Jiabang Township of Congjiang County, southwest China's Guizhou Province, April 20, 2019. Guyu, literally meaning "Rain of Millet", is the sixth of the 24 solar terms created by ancient Chinese to carry out agricultural activities. For the year 2019, the day of Guyu falls on April 20.

A farmer works in a field in Shimen Village of Siba Township, Luocheng County, south China's Guangxi Zhuang Autonomous Region, April 20, 2019. Guyu, literally meaning "Rain of Millet", is the sixth of the 24 solar terms created by ancient Chinese to carry out agricultural activities. For the year 2019, the day of Guyu falls on April 20.

In this aerial photo taken on April 20, 2019, farmers of an agricultural cooperative work in a field in Binzhou, east China's Shandong Province. Guyu, literally meaning "Rain of Millet", is the sixth of the 24 solar terms created by ancient Chinese to carry out agricultural activities. For the year 2019, the day of Guyu falls on April 20.

A farmer works in an orchard in Cuijiazhuang Village of Yuezhuang Township, Yiyuan County, Zibo, east China's Shandong Province, April 20, 2019. Guyu, literally meaning "Rain of Millet", is the sixth of the 24 solar terms created by ancient Chinese to carry out agricultural activities. For the year 2019, the day of Guyu falls on April 20.

In this aerial photo taken on April 20, 2019, farmers work in a field in Shengji Village of Jingzi Township, Shuangfeng County, Loudi, central China's Hunan Province. Guyu, literally meaning "Rain of Millet", is the sixth of the 24 solar terms created by ancient Chinese to carry out agricultural activities. For the year 2019, the day of Guyu falls on April 20.

Farmers work in a field in Yong'an Village of Dongmen Township, Luocheng County, south China's Guangxi Zhuang Autonomous Region, April 20, 2019. Guyu, literally meaning "Rain of Millet", is the sixth of the 24 solar terms created by ancient Chinese to carry out agricultural activities. For the year 2019, the day of Guyu falls on April 20.

Farmers work in a wheat field in a farm in Hai'an, east China's Jiangsu Province, April 20, 2019. Guyu, literally meaning "Rain of Millet", is the sixth of the 24 solar terms created by ancient Chinese to carry out agricultural activities. For the year 2019, the day of Guyu falls on April 20.

A farmer picks tea leaves in a tea garden in Shuitianba Village of Jiaoyuan Township, Xuan'en County, central China's Hubei Province, April 20, 2019. Guyu, literally meaning "Rain of Millet", is the sixth of the 24 solar terms created by ancient Chinese to carry out agricultural activities. For the year 2019, the day of Guyu falls on April 20.

In this aerial photo taken on April 20, 2019, a farmer dries crops in Chaolie Village of Boao Township, Qionghai, south China's Hainan Province. Guyu, literally meaning "Rain of Millet", is the sixth of the 24 solar terms created by ancient Chinese to carry out agricultural activities. For the year 2019, the day of Guyu falls on April 20.