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

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

For the Sidewinder to move laterally to the left with the nose facing front, the two left wheels spin toward each other, and the two right wheels spin away from each other.

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With a little help, you can generally return the ball 40 yards on each kick, assuming you run, spin and jump at the exact right moment.

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The right-hander, who is an occasional spin bowler, will be hoping to win back his place in the team in time for November and December's tour of India.

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