| 单词 | underground tunnel | 
| 释义 | underground tunnel There's no door; instead, you enter through an underground tunnel.   Times, Sunday Times (2012) It's a really interesting place, with a network of underground tunnels built in medieval times.   Times, Sunday Times (2015)  Cities would flood as pumps keeping underground tunnels dry gradually fail.   The Sun (2008)  | 
	
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