英语词汇“fog signal”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	fog signal
释义	fog signal noun A small explosive charge which can be placed on a railway line in fog to be set off by the train as a signal to the driver.Students were taught how to lay dummy charges and fog signals, then walk away and hide.... Beavertail has probably seen more types of fog signals than any other New England lighthouse station. The air fog signal was replaced by an electric omnidirectional signal controlled by a fog detector.
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