Aerial photo taken on March 24, 2022 shows the community isolation facility (CIF) in Yuen Long, south China's Hong Kong. The CIF in Hong Kong's Yuen Long, constructed with the support from the mainland, was handed over to the Hong Kong Special Administrative Region (HKSAR) government on Thursday, marking the full completion of the first phase of mainland-aided medical facilities in Hong Kong. (Xinhua/Li Gang)