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。

youdao

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。

youdao

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。

youdao

I'd like to take this opportunity for a point of information and also to speak briefly to the motion of Mr. Delahunt.

CNN: Transcript: Judiciary Committee impeachment hearing

Chair of the finance committee Conor Murphy said the motion was designed to send a message of cautious support to the Treasury at an important point in the negotiation process.

BBC: Devolution of Corporation Tax

Most gyms have a seated fly machine that uses the forearms as a pressure point to avoid all gripping, and the depth of the motion can be adjusted to reduce rotator cuff stress.

CNN: What kind of strength work won't aggravate rotator cuff issue?