In Canada's arctic, winter is the best driving season because every winter, ice roads are built over frozen rivers and lakes, connecting communities that are usually accessible only by air.

加拿大在北极圈以内的地方，冬季是最好的驾驶季节。每年的冬天，结冰的河流和湖泊上建起了冰路，连通着往时只能乘飞机才能到达的地区。

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Jets do the same thing when air is forced over their wings, though jets cool air by only about 36 degrees Fahrenheit (20 degrees Celsius).

喷气式飞机的机翼对其周围的空气也有同样的作用，但喷气式飞机只能使空气降温36华摄度（20摄氏度）。

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By volume, only two percent of freight is shipped via air; by value, that’s 35 percent.

按体积计算，仅有两成的货品依赖航空运输；但若以价值计算，空运则可占据35%的份额。

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The province is reached only by air from within Angola and the games there are unlikely to attract large visiting crowds.

BBC: Africa Cup of Nations: Venue guide

But when summer comes, this place is stranded, a sodden island teeming with mosquitoes, surrounded by marsh and water, reachable only by air or riverboat.

BBC: News - Today - Life in the oil-rich Siberian town of Strezhevoy

The country is vast, linked only by rivers and whatever air services connect its few airports.

ECONOMIST: Congo