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1·Coronaviruses were discovered in the 1960s.

冠状病毒是在20世纪60年代发现的。

2·In humans, coronaviruses cause respiratory tract infections.

冠状病毒在人体内会引起呼吸道感染疾病。

3·How many ways are mentioned for the spread of the new coronaviruses?

有多少种新冠病毒传播途径被提及？

4·In an inactivated vaccine, the coronaviruses are already killed or made into the ones unable to produce more new viruses.

在灭活疫苗中，冠状病毒已经被杀死或被处理至无法产生更多的新病毒。

5·Since the outbreak of severe acute respiratory syndrome in several regions of the world in2003, the research on coronaviruses has become the focus of virology.

2003年，全世界多个国家和地区暴发了重症急性呼吸系统综合征，这也使冠状病毒的研究成为病毒学领域中最为关注的问题。