安装一个更大的发动机以及一个特别设计的传动齿轮箱。
A larger engine was fitted, together with a specially designed transfer gearbox.
一些业内人士认为齿轮传动窝扇发动机最终可能降低燃油消耗达20 - 25%。
Some in the industry think geared turbofans could eventually reduce fuel consumption by 20-25%.
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.
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