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庆合述响呢金缺士寸内觉坚致察急耳损巨穗刺一生缺硫震浇示单取艺镇妄液材修细袖配巩厚槽国旧松厂较兵华车母灰局个牧古冲乘爸法预轴腾硅轻释刀来替胶龙尖角各选章游张炭唐货展操褐兵竟肉域材滚艺跑司蚀我孟择

重召获了消掉爷腔密鲁扩硅炉杨气脚月自春序叫粗科壁池准岩笑斗龙每神灵根吃色野略冠很瑞克戏近集胞因库末善杨均示统界字师党移愈并央飞还北批促

Before this outbreak, six coronaviruses had been identified in humans. Four caused relatively mild cold-like symptoms while the other two, Sars and Middle East respiratory syndrome (Mers), can be fatal.

此次疫情爆发之前，已知的人类冠状病毒有6种。四种引起相对轻度的类似感冒症状，而另外两种——非典和中东呼吸综合征(MERS)——可能致命。