英语中rottor 与 rotor这两个词有什么区别?如何便用?

1.rottor:

定向干扰自动发射机

2.rotor: [ 'rəutə ]

n. 转子,回转轴,圆筒

例句与用法:
1. A rotor or rotor blade.
叶轮或叶轮片

2. An aircraft powered by a conventional propeller and supported in flight by a freewheeling, horizontal rotor that provides lift.
旋翼机在飞行中以常规的螺旋桨来驱动并靠惯性滑行支持的，提供升力的水平旋转仪