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来自维基百科，自由的百科全书
汽笛是一种借助蒸汽产生声音的装置[1] 。在工厂中当工作开始或结束时会拉动汽笛。蒸汽机车、蒸汽轮船也都配备有汽笛，用于警告以及传达某种信息。从1850年代开始，灯塔上也安装有蒸汽汽笛。 [2]
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