CFCs are the chief destroyers of the ozone layer.
氯氟

坏
氧

凶。
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级听力 COVID-19 is caused by a virus called SARS-CoV-2, or severe acute respiratory symdrome coronavirus 2, because it's genetically similar to the SARS coronavirus, which was responsible for the SARS outbreak in 2002.
COVID-19由SARS-CoV-2病毒(2型严重呼吸综合征冠状病毒)引起;它
基因序列与SARS冠状病毒相似;SARS病毒
于02年底出现、03年蔓延,引起严重急性呼吸综合征(SARS)
元凶。