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1·This height is also the frequent cruising altitude of commercial airliners.

这一高度也是商务航线的常用巡航高度。

2·America has 550 airports that can handle big commercial airliners, and perhaps 10,000 that can handle smaller planes.

美国有550个供大型商务航班起降的机场，并有约10000个供小型飞机起降的机场。

3·America has 550 airports that can handle big commercial airliners, and perhaps 10, 000 that can handle smaller planes.

美国有550个供大型商务航班起降的机场，并有约10000个供小型飞机起降的机场。

4·For virtually all commercial airliners today, the answer is turbofan engines, the latest in a decades-long evolution.

若以目前商用客机而言，答案是“涡轮扇引擎”，它是近数十年来最新的演化成果。

5·The firm wants to reduce its dependence on the cyclical business of supplying commercial airliners, which brings in 65% of revenues.

公司希望通过提供商业飞行机型来减少对民用业务的依赖，前者能带来65%的收益。

6·Commercial airliners around the world follow circuitous flight paths, waste time in holding patterns before landing and burn precious fuel taxiing.

全世界的商业航班的飞行遵循迂回路线，降落之前的姿态控制浪费时间，滑行过程中还要耗费宝贵的燃料。

7·Sealed, air-conditioned buildings and other closed spaces utilizing circulated forced air, like commercial airliners, are also criticized as breeding grounds for communicable diseases.

空调化的封闭建筑及其他象商业客机等使用循环压力送风的封闭空间，也被批评为传染性疾病的滋生地。