We saw that simply imagining a motion, he could activate this part of the brain.
简单地想象一个动作,然后他大脑的某部分就会边活跃。
The curl actually measures twice the angular speed of a rotation part of a motion at any given point.
旋度实际上衡量的是,在任意给定点,运动旋转角速度的两倍。
And, if you want to think about it in terms of motions, that also will measure the rotation part of the motion.
如果从位移的角度,来思考这个问题,它也可以度量位移的旋转部分。
At any instant, your motion, if it follows any curve, locally can be approximated as being part of some circle.
在任何时候,如果做曲线运动,都可以近似地认为是圆周的一部分
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