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	bato baton baton charge Baton Rouge baton round baton twirler baton twirling Batrachia batrachian batrachotoxin bat ray bats batshit batsman batsmanship bat something around (or about) bat stingray batt battalion Battambang battels battement batten Battenberg Battenberg cake

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