例如，假设想要有一个在屏幕中沿着圆形轨迹运动的项。
As an example, say you have an item that you want to move in a circular orbit around the screen.
这不只是在椭圆形的健身房里运动。
It doesn't just have to be working the elliptical at the gym.
就如我们所看见的龙卷风和飓风进行着圆形运动，由于气团应答着相互冲突的力量，大气层也在进行旋转运动。
It swirls, as circular motion in air masses is the response to conflicting forces, as seen in the circular motion of tornadoes and hurricanes.
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