Plants are seen at the World Horticultural Expo Garden in Kunming, Southwest China's Yunnan province, April 7, 2019. Kunming held the World Horticulture Exposition in 1999 and the garden has become a legacy for locals to enjoy the nature. [Photo/Xinhua]

People visit the World Horticultural Expo Garden in Kunming, Southwest China's Yunnan province, April 7, 2019. [Photo/Xinhua]

Staff work at the World Horticultural Expo Garden in Kunming, Southwest China's Yunnan province, April 7, 2019. [Photo/Xinhua]

A girl runs at the World Horticultural Expo Garden in Kunming, Southwest China's Yunnan province, April 7, 2019. [Photo/Xinhua]