| 单词 | Laurent half-shade plate | 
| 释义 | Laurent half-shade plate [lȯ`rän `haf ´shād ´plāt]  OPTICS A device used to determine the direction of polarization of plane polarized light; it consists of a quartz plate of special thickness that covers half of the plane polarized beam, followed by a plane polarization analyzer.  | 
	
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