The Potala Palace is seen through peach blossoms in Lhasa, southwest China's Tibet Autonomous Region on Friday. (Photo: Xinhua)

Aerial photo taken on Monday shows bullet trains at a depot in Wuhan, central China's Hubei Province. Wuhan has lifted outbound travel restrictions from Wednesday after almost 11 weeks of lockdown. (Photo: Xinhua)

Wearing masks and gloves as preventive measures, the Palestinian couple celebrated their wedding during the COVID-19 outbreak on Thursday. (Photo: Xinhua)

Residents do physical exercise on the balconies in Bogota, Colombia, on Tuesday. Colombia reported on Tuesday the number of the country's confirmed COVID-19 cases had escalated to 1,780. (Photo: Xinhua)

An airplane carrying members of the national medical team aiding COVID-19-hit Hubei Province receives a water salute at the Capital International Airport in Beijing, capital of China, on Monday. (Photo: Xinhua)

A young man wearing clown clothes, shows a facial mask to raise people's awareness on COVID-19 in Cairo, Egypt, on Wednesday. (Photo: VCG)

Workers celebrate as construction on the last pivotal tunnel for the Lhasa-Nyingchi section of the Sichuan-Tibet railway was completed on Tuesday. (Photo: Xinhua)

A full moon rises behind the roof of Jiaolou, or Corner Tower, in the Forbidden City of Beijing, Monday. (Photo: China News Service)

A girl watches British Queen Elizabeth II's address on TV in London, Britain. British Queen Elizabeth II spoke in a rare broadcast Sunday night about the COVID-19 pandemic and her hope that people will take pride in how they responded to the crisis. (Photo: VCG)

Students return to No. 2 High School in Nanning, south China's Guangxi Zhuang Autonomous Region, on Monday. Students in the final year of senior and junior high schools returned to school on Tuesday in Guangxi. (Photo: Xinhua)