| 英文摘要 |
"At the end of 2019, COVID-19 began to quickly spread around the world, carried by people moving across borders. By the end of 2020, more than 82 million people had been infected and more than 1.8 million people died as a result of this disease. Cases spread to 191 nations and regions, many of which resorted to lockdowns in the face of overburdened health systems, and as a result severely affected people’s normal way of life." |
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