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camera lucida

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Camera lucida \Cam"e*ra lu"ci*da\ [L. camera chamber + L.
   lucidus, lucida, lucid, light.] (Opt.)
   An instrument which by means of a prism of a peculiar form,
   or an arrangement of mirrors, causes an apparent image of an
   external object or objects to appear as if projected upon a
   plane surface, as of paper or canvas, so that the outlines
   may conveniently traced. It is generally used with the
   microscope.

资料来源 : WordNet®

camera lucida
     n : an optical device consisting of an attachment that enables
         an observer to view simultaneously the image and a
         drawing surface for sketching it
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