Yemeni high school students study with light of candles due to the electricity cut at their house in Sanaa, Yemen, on Saturday. (Photo: Xinhua)

Aerial photo taken on Friday shows mechanical equipment working at the contruction site of a special hospital in the Caidian District of western suburb of Wuhan, central China's Hubei Province. The central China metropolitan of Wuhan will follow Beijing's SARS treatment model to build a special hospital for admitting patients infected in the outbreak of pneumonia caused by the novel coronavirus. (Photo: Xinhua)

Photo taken on Tuesday shows a general view of the Greek Parliament during the vote for the new president of the Hellenic Republic in Athens, Greece. The Greek parliament on Wednesday elected top judge Katerina Sakellaropoulou as president of the Hellenic Republic, the first female head of state of Greece. (Photo: Xinhua)

A woman looks at Chinese lucky charms and decorations at the Chinatown in Manila, the Philippines, on Thursday. The upcoming Chinese Lunar New Year, or the Year of the Rat, which falls on Friday this year. (Photo: Xinhua)

The Tokyo Tower is lit in red for the Chinese Lunar New Year in Tokyo, Japan, on Friday. (Photo: Xinhua)

Medical workers cheer for each other in the ICU (intensive care unit) of Zhongnan Hospital of Wuhan University in Wuhan, central China's Hubei Province, Thursday. (Photo: Xinhua)

Teenagers and mascot Yodli perform at the closing ceremony of the 2020 Winter Youth Olympic Games (YOG) in Lausanne, Switzerland, Tuesday. (Photo: Xinhua)

People take part in the annual Kingdom Day Parade in Los Angeles, the United States, on Monday. The annual Kingdom Day Parade is held to honor the civil rights leader Martin Luther King Jr. (Photo: Xinhua)

A model presents a creation of Chanel's Spring/Summer 2020/2021 Haute Couture collections during Paris Fashion Week in Paris, France, Monday. (Photo: Xinhua)

China's Wang Qiang has done the unthinkable, beating tennis legend Serena Williams, 6-4, 6-7 (2), 7-5, in round three of the Australian open on Friday. (Photo: Xinhua)