backward motion

It can move forward, backward or brake depending on the undulatory motion of the flexible fin.

它依靠柔性长鳍的波动运动来实现载体的前进 、 后退、制动等各种机动动作.

A hinged or pivoted device adapted to fit into a notch of a ratchet wheel to impart forward motion or prevent backward motion. burnishing of gear teeth

掣爪，棘爪一种枢轴或转轴器械，能与齿轮缺口或齿间吻合来前进或防止后移

Motion may go forward or backward or even in circles.

运动可以向前,也可以退后,甚至可以兜圈子.

However, compared with the success experience in foreign, the developing of Stop-Motion Animation is still in a relatively backward state in China. And the relevant theory study about Stop-motion animation is also weaker.

然而与国外定格动画影片在票房和口碑上的成功相比，我国定格动画的发展目前还处于相对落后的状态，国内有关定格动画的理论研究也比较薄弱。

Research on NC Machining Technology Based on Cutting Tool with Forward and Backward Motion

基于刀具进让式进给数控加工技术的研究