Tourists visit Mingsha Mountain and Yueyaquan (Crescent Spring) scenic spot in Dunhuang City, northwest China's Gansu Province, April 3, 2021. (Photo by Zhang Xiaoliang/Xinhua)

Tourists visit Mingsha Mountain and Yueyaquan (Crescent Spring) scenic spot in Dunhuang City, northwest China's Gansu Province, April 3, 2021. (Photo by Zhang Xiaoliang/Xinhua)

Tourists visit Mingsha Mountain and Yueyaquan (Crescent Spring) scenic spot in Dunhuang City, northwest China's Gansu Province, April 3, 2021. (Photo by Zhang Xiaoliang/Xinhua)

Tourists take photos amid tulips at Tianbo General Yang Ye's Mansion scenic spot in Kaifeng, central China's Henan Province, April 3, 2021. (Xinhua/Zhang Haoran)

Tourists visit Mingsha Mountain and Yueyaquan (Crescent Spring) scenic spot in Dunhuang City, northwest China's Gansu Province, April 3, 2021. (Photo by Zhang Xiaoliang/Xinhua)

Tourists take photos amid tulips at Tianbo General Yang Ye's Mansion scenic spot in Kaifeng, central China's Henan Province, April 3, 2021. (Xinhua/Zhang Haoran)

Tourists take selfies amid tulips at Tianbo General Yang Ye's Mansion scenic spot in Kaifeng, central China's Henan Province, April 3, 2021. (Xinhua/Zhang Haoran)

A tourist takes photos of tulips at Tianbo General Yang Ye's Mansion scenic spot in Kaifeng, central China's Henan Province, April 3, 2021. (Xinhua/Zhang Haoran)