air united states 合众国航空公司
United States Air Force Academy 美国空军学院 ; 美国空军军官学校 ; 美空军学院 ; 美国空军专科学院
United States Air Force 美国空军 ; 还负责为美国空军 ; 美国空军学院
United States Army Air Forces 美国陆军航空队
United Air 联合航空 ; 合航空公司
United Eagle Air 鹰联航空
United Air Lines Inc 美国联合航空公司 ; 联合航空公司
cr rhodesian united air carriers 罗得西亚联合航空公司
United States Air Force Memorial 美国空军纪念碑
It's a phenomenon that occurs anywhere you have a large lake that doesn't freeze and have cold air flowing over it, mostly in the Northern Hemisphere Like the great lakes in the United States.
这种现象发生在不结冰的大湖泊附近,这些湖通常被冷空气包围着,并且它们大多数坐落在北半球,就像美国的五大湖一样。
The immensity of the United States makes air travel common place.
因为美国幅员辽阔,乘飞机旅行很常见。
In the twenty years that the Clean Air Act has mandated unleaded gas use in the United States, the lead accumulation worldwide has decreased significantly.
在《清洁空气法案》强制要求美国使用无铅气体的二十年里,铅在世界范围内的累积量显著下降。
Another reason for the increase in bird strikes is the growing popularity of air travel in the United States.
VOA: special.2009.04.01
One of the largest air shows in the United States is also one of the largest trade shows in the aircraft industry.
VOA: special.2010.07.30
We attended this year's United States Air Guitar Championships in Washington,D.C.to learn more about this unusual activity.
VOA: special.2009.08.14
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