全新的动力装置以齿轮传动结构为特点，此结构允许前端风扇转速比中心部分慢3倍，优化了发动机各部分的速度。
The all-new powerplant features a geared architecture allowing the front fan to spin three times slower than the core, thus optimising the speed of each section of the engine.
涡轮在高速运行的时候效率更高，而风扇在低速时效率更高，因此涡扇发动机需要在这两者间达到拖鞋，因为发动机的设计需要他们以相同的速度运行。
Turbines run most efficiently at high speeds, and fans at low speeds, so turbofan engines have to compromise between the two, because the engine's design requires them to turn at the same speed.
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