Pratt & Whitney is exploring putting a gearbox between the fan and the turbine, because fans run more efficiently at low speeds and turbines operate better at high speeds.
Pratt & Whitney在探索将一个变速箱放在风扇和涡轮机中间，因为风扇在低速时效率较高，而涡轮机则在高速时更高效。
Pratt &Whitney is exploring putting a gearbox between the fan and the turbine, because fans run more efficiently at low speeds and turbines operate better at high speeds.
而普拉特&惠特尼则正在尝试在风扇和涡轮之间加入一个变速箱，因为风扇低速运转更高效，而涡轮机高速运转则更高效。
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