国语：新冠疫苗研发入佳境 美国或夏季结束前大量生产New crown vaccine research and development enters a good situation
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国语：专家指英国冬天或面临第二波大爆发 可多达12万人死亡Experts say that UK may face a second wave of outbreaks in the winter

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国语：新冠疫苗研发入佳境 美国或夏季结束前大量生产New crown vaccine research and development enters a good situation

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