Scientists who track coronavirus mutations are closely monitoring an uptick in cases of an Omicron sub-variant named BA.2, just as countries were beginning to hope the worst of the latest wave of Covid-19 infections had passed.
在各國開始希望最新一波新冠病毒感染的最糟糕時期已經過去之際，追蹤新冠病毒突變的科學家正在密切監測一種名為BA.2的奧密克戎(Omicron)亞變體病例的增加。
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