A boy plays toy plane in Hohhot, north China"s Inner Mongolia Autonomous Region, April 29, 2023. The 5-day Labor Day holiday started on Saturday. (Xinhua/Peng Yuan)

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People take a boat on the Dongxi river in Fuzhou, southeast China"s Fujian Province, April 29, 2023. The 5-day Labor Day holiday started on Saturday. (Xinhua/Lin Shanchuan)

People look at a giant panda at Chimelong Safari Park in Guangzhou, south China"s Guangdong Province, April 29, 2023. The 5-day Labor Day holiday started on Saturday. (Xinhua/Huang Guobao)

A girl feeds a giraffe at Chimelong Safari Park in Guangzhou, south China"s Guangdong Province, April 29, 2023. The 5-day Labor Day holiday started on Saturday. (Xinhua/Huang Guobao)

People take selfies at the Temple of Heaven in Beijing, capital of China, April 29, 2023. The 5-day Labor Day holiday started on Saturday. (Xinhua/Ju Huanzong)

People take boats in the Summer Palace in Beijing, capital of China, April 29, 2023. The 5-day Labor Day holiday started on Saturday. (Xinhua/Ren Chao)

This aerial photo shows people visiting Baima river by boats in Fuzhou, southeast China"s Fujian Province, April 29, 2023. The 5-day Labor Day holiday started on Saturday. (Xinhua/Jiang Kehong)

This aerial photo shows people visiting Huangshizhai scenic spot in Zhangjiajie, central China"s Hunan Province, April 29, 2023. The 5-day Labor Day holiday started on Saturday. (Photo by Wu Yongbing/Xinhua)

This aerial photo shows people visiting Sheyanghu Township of Baoying County, east China"s Jiangsu Province, April 29, 2023. The 5-day Labor Day holiday started on Saturday. (Photo by Shen Dongbing/Xinhua)

People play drifting game at Zhuquan Village, Tongjing Township, Yi"nan County in Linyi, east China"s Shandong Province, April 29, 2023. The 5-day Labor Day holiday started on Saturday. (Photo by Wang Yanbing/Xinhua)

People visit the Mingsha Mountain and Crescent Spring scenic spot in Dunhuang, northwest China"s Gansu Province, April 29, 2023. The 5-day Labor Day holiday started on Saturday. (Photo by Zhang Xiaoliang/Xinhua)

Tourists visit the Ruins of St. Paul"s in Macao, south China, April 29, 2023. The 5-day Labor Day holiday started on Saturday. (Xinhua/Cheong Kam Ka)

Tourists visit the Senado Square in Macao, south China, April 29, 2023. The 5-day Labor Day holiday started on Saturday. (Xinhua/Cheong Kam Ka)

Tourists visit the Ruins of St. Paul"s in Macao, south China, April 29, 2023. The 5-day Labor Day holiday started on Saturday. (Xinhua/Cheong Kam Ka)

Tourists visit the Ruins of St. Paul"s in Macao, south China, April 29, 2023. The 5-day Labor Day holiday started on Saturday. (Xinhua/Cheong Kam Ka)