This is called rotational grazing, and we received a question from Zhang Guohui in China about how it works.

VOA: special.2009.01.06

So another way to think about that is just the rotational kinetic energy of our electron.

或者，这样想,它是，电子旋转的动能。

麻省理工公开课 - 化学原理课程节选

So if we say that l is just talking about our kinetic energy part, our rotational kinetic energy, and we know that electrons have potential energy, then it makes sense that l, in fact, can never go higher than n.

如果我们说，l仅仅是,描述动能项，我们的旋转动能，我们知道，电子有势能，所以可以理解，l不能比n高。

麻省理工公开课 - 化学原理课程节选

Farmers can start rotational grazing by removing animals from a pasture when the grass is eaten to less than 5 centimeters.

VOA: special.2009.01.06

Experts say rotational grazing is good for the land and the animals, and it can save money.

VOA: special.2010.01.19

Experts say that while rotational grazing can save money over time, it also requires planning.

VOA: special.2010.01.19

Rotational grazing can even help prevent wildfires by keeping grasslands in good condition.

VOA: special.2010.01.19

This is called rotational grazing.

VOA: special.2010.01.19