| 单词 | pinch | 
| 释义 | pinch [pinch]  ENGINEERING The closing-in of borehole walls before casing is emplaced, resulting from rock failure when drilling in formations having a low compressional strength.  GEOLOGY Thinning of a rock layer, as where a vein narrows.  MINING ENGINEERING See <<horseback>>, <<squeeze>>  | 
	
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