Like a tedious series of horror movie sequels, the mutations of the Sars-Cov-2 virus are losing their power to shock. But the latest strains, which are adept at evading immunity, have spread fast.
就像一系列乏味的恐怖電影續(xù)集一樣，Sars-Cov-2病毒的變異正在失去其破壞力。但最新的毒株善于避開免疫系統(tǒng)，傳播速度很快。
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