 A large tiger is sedated as people perform dental surgery on it SEBASTIEN BOZON / AFP Baikal, a 14-year-old Siberian tiger, has dental surgery to cure an infection, at the Mulhouse Zoological and Botanical Park, France.  A cyclist passes a temple whilst surrounded by a thick sandstorm STEPHEN SHAVER / SHUTTERSTOCK A cyclist navigates a thick sandstorm in Beijing. The Chinese capital's weather bureau called it the worst sandstorm in a decade, with air pollution levels in some districts reaching 160 times the recommended limit. Beijing faces regular sandstorms in March and April, due to its proximity to the Gobi desert.  Students dressed as astronauts LAURENT GILLIERON / EPA Students in Lausanne, Switzerland, take part in a lesson to simulate life in a space base on the planet Mars.  Pigeons are seen against a landscape of war-torn buildings DELIL SOULEIMAN / AFP Pigeons owned by Abdulhamid Hana, a 50-year-old Syrian pigeon-keeper, are pictured on his roof in the city of Raqa.  People lay flowers around a circle of candles on a street AFP People lay flowers and candles at a site in Yangon, Myanmar, where protesters died during demonstrations against the recent military coup. Activists say 38 protesters were killed on Monday, in one of the bloodiest days since the coup.  A man holds basket of salt whilst standing in a large pink lake MARCO LONGARI / AFP Toure, a Gambian salt harvester, holds a basket filled with salt collected from the crust of the bottom of Lake Retba (Pink Lake) in Senegal. The lake owes its name to the pink waters caused by the Dunaliella salina algae, and is known for its high salt content.  People walk through a large colourful art installation PHILIP FONG / AFP People walk inside an interactive art installation called Ephemeral Solidified Light, during a preview of the teamLab Reconnect exhibition - which combines art and sauna - in the Roppongi district of Tokyo.  Children play with elephants in a river CHALINEE THIRASUPA / REUTERS Young elephant riders, known as mahouts, play with elephants in the Chao Phraya river after the celebration of Thailand's National Elephant Day, in the city of Ayutthaya.  A person fits artificial skin on to the head of a robot YURI MALTSEV / REUTERS An employee attaches "skin" to the head of a humanoid robot developed by Promobot, a service robotics manufacturer, in Vladivostok, Russia.  A person looks at a colourful sculpture in a woodland DANNY LAWSON / PA MEDIA An art installation called Colour Forms, by artists Lenny and Whale, has been unveiled in Wentworth Castle Gardens in Barnsley, South Yorkshire. The sculpture is inspired by Lady Mary Wortley Montagu, a vaccination pioneer, who brought the concept of the smallpox inoculation to England from Turkey in 1721. |
 大都会美术馆财务危机 March 21, 2021 - 纽约大都会艺术博物馆，一名游客正在欣赏梵高《自画像》。受新冠疫情影响，大都会艺术博物馆正在考虑出售部分馆藏艺术品以补充运营资金。馆方推测至2021年6月累计收入损失达到1.5亿美元，财务状况未来数年还将进一步恶化。2020年访问纽约游客人数暴跌66.5%至2230万人。摄影师：John Smith |
 联盟号宇航员训练
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