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电影续集一样，Sars-Cov-2病毒的变异正在失去其破坏力。但最新的毒株善于避开免疫系统，传播速度很快。
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