单词	achromat
释义	achromat /ˈakrə(ʊ)mat / noun A lens that transmits light without separating it into constituent colours.Quartz-sapphire and quartz-lanthanum fluoride achromats provide better performance.... The long focus achromat is certainly not portable but it does give superb images at a reasonable cost. The two-element lenses used in today's achromats greatly reduce the chromatic aberration.
随便看	propositionise propositionising propositionize propositionizing propositus propound propounder propoundment propoxur propoxyphene proppage proppant propper proppily proppy propr. propraetor propraetorial propraetorian propraetorship propranolol proprefect propretor propriate propriation

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