But the original star's angular momentum is preserved.

但原始恒星的角动量被保留了下来。

Basically, an object’s angular momentum describes its tendency to stay rotating.

基本上， 物体的角动量描述了它保持旋转的趋势。

And, like linear momentum, angular momentum is always conserved.

和线性动量、角动量一样 一直得救。

Well, there's also angular momentum, which is equal to an object's moment of inertia times its angular velocity.

那么还有角动量，等于 因为物体的惯性矩乘以它的角速度。