| 单词 | cardinal point | 
| 释义 | cardinal point [`kärd·nǝl ¦pȯint]  GEODESY Any of the four principal directions: north, east, south, or west of a compass.  OPTICS Any one of six points in an optical system, namely, the two principal points, two nodal points, and two focal points. Also known as Gauss point.  | 
	
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