foghorn [ˈfɒghɔ:n]

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n..雾号（浓雾信号）

a horn that makes a very loud sound to warn ships that they are close to land or other ships

The foghorn boomed out its warning. 雾角鸣声示警。
The ship foghorn boomed out. 船上的浓雾号角发出呜呜声。