The resulting evolution of its engines has steadily improved fuel efficiency and over the past 30 years has extended the operating life of engines tenfold (to about ten years between major rebuilds).
这种“反馈—改进”模式使得它的引擎的燃料效率稳步提高，在过去30年中，引擎的运行寿命扩展了十倍（引擎两次大修之间的时间达到10年）。
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。
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。
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