有些运动主要涉及整体的垂直或水平运动，其中转动可以忽略，可以用三维线性运动的简单方程来研究。
Some movements involving primarily vertical or horizontal motions of the body as a whole, in which rotations can be ignored, can be studied using simple equations of linear motion in three dimensions.
在曲线的胡克定律，所适用的线性区域内，在绳子上挂一重物。，或者挂在棒子上，然后让它垂直振荡。
Because in the linear portion of the curve where Hooke's Law holds, I could hang a weight on the rope... or on the rod and I could let it oscillate vertically.
虽然无限的水平线性可扩展性是难以实现的，无限的垂直扩展性也是不可能的。
While infinite horizontal linear scalability is difficult to achieve, infinite vertical scalability is impossible.
应用推荐