Now, at the left of the origin, it turns around and starts coming to the origin and going to the right.

现在,到了原点的左边,它又转向,开始向原点运动,并到了原点右边

耶鲁公开课 - 基础物理课程节选

This says that when it comes to ions line-dancing trumps ballroom dancing.

这种说法表明,离子是一列一列运动,而不是向舞厅那样一起运动。

麻省理工公开课 - 固态化学导论课程节选

That means, if you are going in a plane and you throw something up in the air, it seems to be going up and down to you.

也就是说,如果你在飞机中,你向空中扔出一物体,它也许会相对于你上下运动

耶鲁公开课 - 基础物理课程节选

I'm asking what's the tangential speed as it moves along the circle?

它在做圆周运动时,切向速度是多少

耶鲁公开课 - 基础物理课程节选

You send something, you'll find it goes on forever.

向外抛一个物体,它就会一直运动下去

耶鲁公开课 - 基础物理课程节选