The World Health Organization designated Delta as a variant of interest in April and a variant of concern on 11 May.

  • 世界卫生组织在四月份将德尔塔毒株定性为“待观察变种”,5月11日又将该毒株定性为“须关切变种”。

  • 互联网摘选 2025-01-20 17:21:59

    • 相关例句
    精确
    • 模糊
    • 词首
    • 词尾
    • 词义
    • 例句