这个风扇的旋转速度可以通过遥控器调节。

The fan's ___rotational speed can be adjusted with the remote control.

这个项目采用了轮换制度，每个成员都会轮流负责汇报工作。

The project uses a ___rotational system where each member takes turns presenting the work.

这个风扇的旋转叶片设计非常高效。

The fan's ___rotational blades are designed for high efficiency.