And keep that with you, because it's going to be important in what follows we can derive three things: the radius, the period of rotation and the speed of the object as I twirl it around.

从这条曲线，记住这条曲线，So, from, that, curve—，因为接下来它会，很重要，从中你们推导出3样：，半径，自转周期，已经我旋转的，物体的速度。

youdao