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.
雾起，立即召唤船长，开始保持每20分钟用雷达环扫一次海面，回声测深52拓，备车，开启雾号。
Fog sets in, call master at once. Began to keep on radar for detecting to the sea all round at an interval of every 20 minutes. Sounding by echo 52 fathoms. Standby Engine. Fog signal started.
雾来了，立即召唤船长，开始保持每20分钟用雷达环扫一次海面，回声测52拓，备车，开始雾号。
Fog comes, call Captain at once. Began to keep on radar for detecting to the sea all round atr a interval of every 20 mins. Sounding by echo 52 fms. S/B. Fog sig started.
用0.8M的柠檬酸汽雾剂喷15分钟诱导猪咳嗽，由一个熟练的观察者统计30分钟的咳嗽次数。
Coughing was induced by challenging pigs with an aerosol of 0.8 m citric acid over 15 min. Coughs were counted by a trained observer for 30 min.
用0.8M的柠檬酸汽雾剂喷15分钟诱导猪咳嗽，由一个熟练的观察者统计30分钟的咳嗽次数。
Coughing was induced by challenging pigs with an aerosol of 0.8 m citric acid over 15 min. Coughs were counted by a trained observer for 30 min.
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