| 单词 | formidable challenge | 
| 释义 | formidable challenge They face formidable challenges.   Times, Sunday Times (2016) The concert he's talking about is a formidable challenge for a man who's been learning the piano for less than two years.   Times, Sunday Times (2013) This is a formidable challenge for historians, because the technical difficulties of studying past migrations are imposing.   Migrants in Modern France: Population Mobility in the Later Nineteenth and Twentieth Centuries (1989)  | 
	
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