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。
Line is simply a point that moves continuously, like the edge of a shape or the motion of a single brush stroke.
线就是点的连续移动,比如图形的边,或者画笔笔触的移动轨迹。
And then Mr. Chen came into view conspicuous for being the only still point in that sea of motion…and the only one sporting a pair of clunky binoculars the only one watching the watchers of the river.
然后老陈就出现在我的视线中,十分显眼,因为他是涌动的人流中唯一一个站着不动的人,唯一一个摆弄着厚底望远镜的人,唯一一个监视着那些在河边凝望的人。
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