Long journeys and overnight stops may be unavoidable because nowadays many air trips, especially in the United States, involve passing through big hub airports and catching connecting flights.

漫长的旅途和在中转站过夜似乎难以避免，尤其是在美国，牵扯到途经大的中转机场转机的情况。

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The alert is expected to urge American citizens in Europe to be vigilant, especially when in public places such as public transportation, airports, and tourist sites, officials said.

该警告旨在使欧洲的美籍人员保持警惕，尤其是在公共场合，如公交车站，机场和旅游景点。

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Effective removal of icing, especially Bridges, highroads, airports and other important facilities 'deicing, has been concerned by countries where located in the high-latitude.

快速有效的清除路面冰层，尤其是桥梁、高速公路、机场等重要的公共基础设施的除冰，一直是地处高纬度国家比较关注的问题。

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Airlines say they have to build in delays so schedules reflect reality, especially at congested airports in the Northeast and at big, crowded hub airports.

WSJ: Flight Times Grow As Airlines Pad Schedules

Behind such optimism is Airbus's view that, with air travel rising steadily at around 5% a year and limited capacity at big airports, especially in Asia, there is a clear need for larger aircraft.

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The gap shows, especially in infrastructure such as roads, sea- and airports, and electricity supply.

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