angle of nutation

例句：

1. 1. The airplane's noseis pointing at the sun.
   飞机的机头指向太阳。
2. 2. The car's wheels areturning at an angle.
   汽车的轮子在转动一个角度。
3. 3. The boat is driftingwith the current.
   船随着水流漂移。