当用户最近的接触者之一被发现感染了新冠肺炎后，这些软件可以告知用户。
The apps can tell users when one of their recent contacts has been found to have COVID-19.
17年后，他再次帮助国家抗击被世界卫生组织宣布为大流行病的新冠肺炎。
Over 17 years later, he again helped the country to fight against COVID-19, which has been declared a pandemic by the World Health Organization.
心后性肺炎是一种发生在心脏后方的肺炎。
Retrocardiac pneumonia is a form of pneumonia that is found behind the heart.
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