这个场里没有旋度，旋度是不度量拉伸之类的东西的。

There is no curl. This is not what curl measures.

youdao

另一个向量场，是通过计算第一个向量场的旋度得到的，计算旋度之后，就可以得到一个不同的向量场。

That other field is given from the first one just by taking its curl So, after you take the curl, you obtain a different vector field.

youdao

关于旋度的更多介绍，设有一速度场，我们知道旋度是测量旋转影响的。

More about curl.If we have a velocity field, then we have seen that the curl measures the rotation affects.

youdao

So by parallel we mean - they're either both spin up remember that's our spin quantum number, that fourth quantum number.

所以我们意味着,它们都是自旋向上,记住我们的自旋量子数，是第四个量子数。

麻省理工公开课 - 化学原理课程节选

And this spin magnetic quantum number we abbreviate as m sub s, so that's to differentiate from m sub l.

这个自旋磁量子数我们把它简写成ｍ下标ｓ,以和ｍ小标ｌ有所区分。

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