Scientists are anxiously tracking a descendant of the Delta coronavirus, which is responsible for a growing proportion of Covid-19 cases in the UK, and could be more infectious than the original Delta variant, they say.
科学家们正在焦急地追踪Delta新冠病毒的一种后代,他们表示,这种新冠病毒在英国造成了越来越多的新冠病例,可能比最初的Delta变种更具传染性。
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