这是一架有八个座位的双螺旋桨飞机。

The plane is an eight-seater with twin propellers.

《柯林斯英汉双解大词典》

由连接在脚踏带上的双螺旋桨提供动力，潜艇的时速可达到8公里，并能下潜至6米深。

Powered by twin propellers connected to a pedal belt, the mini-sub can reach speeds of 8 kilometers an hour and can reach depths of 6 meters.

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在建立舰船辐射噪声仿真模型的基础上，推导了单、双螺旋桨舰船辐射噪声调制谱谐波族幅值特征的数学期望表达式。

On the basis of building the ship radiated-noise model, the mathematical expectation expressions of ship radiated-noise demodulation spectrum harmonic clan feature were educed.

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