As rising coronavirus infections force some countries to reimpose restrictions, scientists and drugmakers are racing to answer a crucial question: how well do the current vaccines protect against the Delta variant?
随着冠状病毒感染率的上升迫使一些国家重新实施限制措施，科学家和制药商正在竞相回答一个关键问题：目前的疫苗能在多大程度上抵御德尔塔病毒变体？
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