Note that in light with orbital angular momentum, the direction of polarization (denoted by the direction of the arrow) does not change across the cross section.

值得注意的是，具有轨道角动量的光，偏振方向(用箭头方向表示)在截面内部发生变化。

youdao

They circle the orbital motion the direction to be consistent (from the solar North Pole looked is counter clockwise), therefore, the scientists remove Pluto outside the nine planets.

它们绕轨道运动的方向一致(从太阳北极上看是逆时针方向)，因此，科学家们把冥王星排除在九大行星之外。

youdao

Seven of the planets rotate in the same direction as their orbital motions, while Venus and Uranus rotate in the opposite direction.

天体中有七颗行星的旋转方向与自己的轨道运动方向相同，而金星和天王星则以相反方向旋转。

youdao