| 单词 | covid-19 case | 
| 释义 | > as lemmasCovid-19 case   General use as a modifier, as in  Covid-19 case,  Covid-19 test,  Covid-19 virus, etc. ΚΠ 2020    N.Y. Times 		(Electronic ed.)	 11 Feb.  				There are 393 COVID-19 cases abroad, in a total of 24 countries. 2020    Times 		(Nexis)	 4 Apr. 7  				Studies have found that the Covid-19 virus can survive in airborne droplets for several hours. 2020    MailOnline 		(Nexis)	 4 May  				When a patient is discharged from hospital after having two negative COVID-19 tests, they must isolate for two weeks. 2020    N.Y. Times 		(Nexis)	 6 June  a7  				N95s are far more effective than surgical masks in protecting health care workers from Covid-19 exposure. < as lemmas | 
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