一旦湿度达到了一定的数值，探雾器就会自动激活雾号。
Once this reaches a certain level, the detector automatically activates the foghorn.
我还兴致勃勃地看了看探雾器，头天晚上让我不得安宁的雾号就是这个家伙弄出来的。
I also enjoyed taking a look at the fog detector, responsible for starting the foghorn that had disturbed my peace the night before.
雾号轰隆隆地发出警告。
雾号整夜发出刺耳的叫声。
下列哪项出版物列出了所有对航海有影响的灯塔、灯船、灯浮标(高度超过8米)、雾号和雾灯。
D__ gives listings of all lighthouses, lightships, lit floating marks (over 8m in height), fog signals and lights of navigational significance.
下列哪项出版物列出了所有对航海有影响的灯塔、灯船、灯浮标(高度超过8米)、雾号和雾灯。
D__ gives listings of all lighthouses, lightships, lit floating marks (over 8m in height), fog signals and lights of navigational significance.
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