Equipped with large rotor blades and gears to adjust its speed , a turboshaft unit offers " acceptable efficiency " in both air and water , they say .

为了调节速度，可以给它安装较大的旋转叶片和齿轮，他们说，在水和空气中，涡轮轴发动机装置提供的效率“可以接受”。

The auburn students came up with much the same strategy in their design , opting for a type of gas turbine called a turboshaft to get the best performance .

奥本学校的学生在其设计中采取了相似策略，为了获得最佳性能，他们采用了一种名叫”涡轮轴发动机“的燃气涡轮机。