Tourists enjoy their leisure time during the Labor Day holiday in Fenglongwan, Xundian Hui and Yi Autonomous County, southwest China's Yunnan Province, May 4, 2020. (Xinhua/Yang Zongyou)

Aerial photo taken on May 4, 2020 shows tourists enjoying their leisure time at a garden during the Labor Day holiday in Hefei, east China's Anhui Province. (Xinhua/Zhang Duan)

Aerial photo taken on May 4, 2020 shows tourists enjoying their leisure time at a garden during the Labor Day holiday in Hefei, east China's Anhui Province. (Xinhua/Zhang Duan)

Aerial photo taken on May 4, 2020 shows tourists enjoying their leisure time at a garden during the Labor Day holiday in Hefei, east China's Anhui Province. (Xinhua/Zhang Duan)

A tourist enjoys her leisure time at a garden during the Labor Day holiday in Hefei, east China's Anhui Province, May 4, 2020. (Xinhua/Zhang Duan)

A tourist enjoys her leisure time at a garden during the Labor Day holiday in Hefei, east China's Anhui Province, May 4, 2020. (Xinhua/Zhang Duan)