| 单词 | known case | 
| 释义 | known case The last known case was a three-month old who recovered last month.  The Sun  We were witnessing a phenomenon so rare that there was, until three years ago, no known case anywhere in the world.  Times, Sunday Times  In 2007, a specimen was found with two heads, the oldest known case of polycephaly.  Retrieved from Wikipedia CC BY-SA 3.0   It was more notably the first known case of professional gamblers' attempting to fix a professional sport.  Retrieved from Wikipedia CC BY-SA 3.0   It was the first known case of sabotage aboard a commercial jet airliner.  Retrieved from Wikipedia CC BY-SA 3.0    | 
	
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