一个是我保持a恒定,那么当然b就会变化，因为这个宽是不变的。,那么当改变θ角时，高度增加了，从而这条边的长度增加了。

One is I keep a constant, and then of course b will have to change because if this width stays the same, then when I change theta, the height increases, and then this side length increases.

youdao

在我增加高度转向返回的过程中我始终让机头与观众保持一定的偏离。

I maintain a heading away from the crowd as I gain the altitude I need to pitch back in.

youdao