And that force tends to cause it, if you have a moving charged particle, to deflect its trajectory and start rotating in a magnetic field.
这个力会产生这样的作用，有一个运动中的带电微粒，磁力会使其轨道偏转，并在磁场中做旋转。
And, if you take a vector field where maybe everything is rotating, a flow that's just rotating about some axis, then you'll find that its divergence is zero.
如果取一个有旋的向量场，流体流动方向是环绕某个坐标轴的，那么就会发现它的散度是零。
In the dynamo, mechanical energy is used for rotating the armature in the field.
在直流发电机中机械能用来使电枢在磁场中转动。
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