a device that gives signals by reflecting flashes of light from the sun 日光反射信号器;日光仪 -
a message that is sent using signals from a heliograph 日光反射信号 a special camera that takes photographs of the sun (拍摄太阳用的)太阳照相仪
👨🏻🏫 Mr. Ng 牛津詞典 📚 – oxford.mister5️⃣.net
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