| 单词 | evolutionary ladder | 
| 释义 | evolutionary ladder He's a few notches up the evolutionary ladder.  Times, Sunday Times  Few species are lower down literature's evolutionary ladder than the much-derided ghostwriter of sporting autobiography.  Times, Sunday Times  We have moved up the rungs of the evolutionary ladder since those primordial days.  ST  This discovery no doubt promotes them a few steps up the evolutionary ladder - something to celebrated.  Times, Sunday Times   | 
	
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