In the large spin limit, the degrees of freedom of the spin part can be described by the classical Ising spins.
在大自旋极限下，自旋自由度可以近似用经典自旋来描述。
One way to think about it, if we want to use a classical analogy, which often helps to give us an idea of what's going on, is the spin of an electron, we can picture it rotating on its own axis.
如果我们用一个，经典的比喻来考虑它的话，这经常会帮助我们建立起一些概念，就是我们可以把电子的， 自旋想象是它绕着轴自转。
Based on this picture, we derive the classical analogy of the covariant continuity equation which the spin current obeys.
基于此图像，我们给出了自旋流满足的协变形式连续性方程的经典对应。
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