轴心点

The Pivot Point is also extensively used in the 3D Viewport.

边界框中心

质心点

The median point is the points that is closest to all the origins of the selected strips. You can think of it as the midpoint of the area that is covered with the selected strips.

Sometimes you want to rotate a strip around a specific point in the preview. Therefore, you can set the 2D Cursor and change the pivot point accordingly.

各自的原点