雾钟是以钟声作为音响信号的雾号设备。以抗蚀材料制成，能发出清晰的音调，其声响是海上避碰的有效手段。
... flat bottom (rails) 底盘(火车) fog bell 雾钟 foreign body 夹杂物(玻璃缺陷)，外来物体，异物 ...
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虽然美国的灯塔在外观和结构上存在一些差异，但它们确有些共同之处，比如都有灯标、有住房、有时还有钟后来改用雾角。
Notwithstanding differences in appearance and construction most American lighthouses Shared several features: a light living quarters and sometimes a bell or later a foghorn.
虽然美国的灯塔在外观和结构上存在一些差异，但它们确有些共同之处，比如都有灯标、有住房、有时还有钟(后来改用雾角)。
Notwithstanding differences in appearance and construction, most American lighthouses Shared several features: a light, living quarters and sometimes a bell (or later, a foghorn).
远离火源30分钟，直到所有的霜和雾都消失。
Keep sources of ignition away for 30 minutes after all frost or fog has disappeared.
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