Aerial photo taken on March 20, 2017 shows farmland of cole flowers in Yangxian County, Northwest China’s Shaanxi province, March 20, 2017. [Photo/Xinhua]

Aerial photo taken on March 20, 2017 shows farmland of cole flowers in Yangxian County, Northwest China’s Shaanxi province, March 20, 2017. [Photo/Xinhua]

Aerial photo taken on March 20, 2017 shows farmland of cole flowers in Yangxian County, Northwest China’s Shaanxi province, March 20, 2017. [Photo/Xinhua]