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heliograph是什么意思

heliograph

美['hiːliəɡræf]  英['hiːliəɡrɑːf]
v.  照相制版;太阳摄影机;日光仪

英英释义

Noun
  1. an apparatus for sending telegraphic messages by using a mirror to turn the sun's rays off and on
Verb
  1. signal by means of a mirror and the using the sun's rays
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