Aerial photo shows farmers working in the fields at Linquan Township, Qianxi County, southwest China's Guizhou Province, March 21, 2019, also the day of "Chunfen". Chunfen, which literally means Spring Equinox or Vernal Equinox, falls on the day when the sun is exactly at the celestial latitude of zero degrees. (Xinhua/Tao Liang)