A new variant of Covid-19 is spreading rapidly across the US this holiday season, even as Americans’ interest in getting vaccinated has faded.
今年圣誕假期，新冠的一個(gè)新變種在美國(guó)迅速傳播，而美國(guó)人對(duì)接種疫苗的熱情已經(jīng)消退。
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