"If black holes grow by merging, by combinations of black holes, they should spin down quite quickly," Blandford explains.

如果黑洞是依靠合并来成长的，在合并的过程中，他们的旋转速度很快就会变慢。

youdao

So you can see, if it's spinning on its own axis in this direction we'd call it spin up, where as this way it would be what we call spin down.

你们可以看到，如果它绕自己的轴朝这个方向转，我们就说它是自旋朝上，这个方向我们叫它自旋朝下。

youdao

We laid there all day, and watched the rafts and steamboats spin down the Missouri shore, and up-bound steamboats fight the big river in the middle.

我们一整天躺在那里，看着一些木筏子和轮船沿着密苏里河岸向下游驶去，看着朝上游驶去的轮船在大河的河水中央使劲搏斗。

youdao

/2 You can have it equal to plus 1/2, and that's what we call spin up, 1/2 or you can have it equal to minus 1/2, which is what we call spin down.

它可能会等于，我们叫它自选朝上，或者它等于负，我们叫它自旋朝下。

麻省理工公开课 - 化学原理课程节选

So what that means is that we're limited in any atom to having two electrons per orbital, right, because for any orbital we can either have a spin up electron, a spin down electron, or both.

这意味着在一个原子内,每个轨道上可以有两个电子，对吧，因为对任何轨道,我们可以有自旋向上或者自选向下或者两者都有。

麻省理工公开课 - 化学原理课程节选

And some of them might be spinning clockwise, in which case, according to the right-hand rule we would consider them spin-down.

而另一些电子则是在顺时针自旋，在这种情况下，根据右手定理,我们会以为它是在向下转。

麻省理工公开课 - 固态化学导论课程节选

Still, Motorola boxes currently lack spin down, although a spokesman says that could change next quarter.

FORBES: Magazine Article

Electrons are subatomic spinning tops: Spin up and spin down are the electron's version of clockwise and counterclockwise.

FORBES: Magazine Article

Another would be to slow a pulsar's spin down in pretty short order.

ECONOMIST: Pulsars