Judges evaluate watermelons during the 31st Daxing Watermelon Festival in Panggezhuang Township of Daxing District in Beijing, capital of China, May 25, 2019. (Xinhua/Li Xin)

Watermelons from all over the country are seen on a weigh-off contest during the 31st Daxing Watermelon Festival in Panggezhuang Township of Daxing District in Beijing, capital of China, May 25, 2019. (Xinhua/Li Xin)

Farmer Li Tiejun takes the first place on a weigh-off contest with a 80.06-kilogram-watermelon during the 31st Daxing Watermelon Festival in Panggezhuang Township of Daxing District in Beijing, capital of China, May 25, 2019. (Xinhua/Li Xin)