| 单词 | plunge | 
| 释义 | plunge [plǝnj]  ENGINEERING 1. To set the horizontal cross hair of a theodolite in the direction of a grade when establishing a grade between two points of known level.  2. See <<transit>>  GEOLOGY The inclination of a geologic structure, especially a fold axis, measured by its departure from the horizontal. Also known as pitch; rake.  | 
	
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