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heliograph

noun
/ˈhiːliəɡrɑːf/
/ˈhiːliəɡræf/
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  1. a device that gives signals by reflecting flashes of light from the sun日光反射信号器;日光仪
  2. (also heliogram
    /ˈhiːliəɡræm/
    /ˈhiːliəɡræm/
    )
    a message that is sent using signals from a heliograph日光反射信号
  3. a special camera that takes photographs of the sun(拍摄太阳用的)太阳照相仪

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