Angularvelocity means not how many meters per second but how many radians per second.
角速度不是指每秒经过的路程，而是指每秒经过的弧度。
2
And angular acceleration is the derivative of angularvelocity.
角加速度等于，角速度的导数。
3
The Earth has an orbital velocity, v I call it v orbital, and there is on the object the angularvelocity, It goes around with a certain angularvelocity.