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heliograph    
n. 照相制版,太阳摄影机,日光仪
vt.
vi. 用太阳摄影机拍摄,用日光仪传递

照相制版,太阳摄影机,日光仪用太阳摄影机拍摄,用日光仪传递

heliograph
日光反射信号器

heliograph
n 1: an apparatus for sending telegraphic messages by using a
mirror to turn the sun's rays off and on
v 1: signal by means of a mirror and the using the sun's rays


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