Researchers in the US have discovered two new variants of coronavirus, one of which they say has became the dominant strain in the state of Ohio’s capital, Columbus, within just three weeks.
美国研究人员发现了两种新型冠状病毒新变种,他们称其中一种已在短短3周内成为俄亥俄州首府哥伦布(Columbus)流行的主要毒株。
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