| 单词 | drop-shutter | 
| 释义 | > as lemmasdrop-shutter   drop-shutter  n.  Brit. , U.S. a device for securing very brief exposure in instantaneous photography; see quot. ΚΠ 1890    W. de W. Abney Treat. Photogr. 		(ed. 6)	 235  				The principle of a drop~shutter is the passing of an elongated aperture, cut in a board, over the front of the lens. < as lemmas | 
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