n. heliogram
... 日光电报信息 日光反射信号器发送的nheliogram 日光反射信号 heliogram 日光反射信号器 heliograph ...
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日光反射信号器 [通信] heliograph
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更近一点例子是，“日光反射信号器”一直通过类似的方式传递军事信号。
More recently, so-called “heliographs” have been used to relay military signals in a similar way.
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More recently, so-called "heliographs" have been used to relay military signals in a similar way.
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