1.
This is a useful variable to employ when you have directional information to convey (up or down, backward or forward).
当我们有和方向有关的信息需要传达时（上或下，前进或后退），方位是个很有用的变量。
2.
I would like to use a picture (to describe) : a bridge from one bank of a river to the other side, where you cn walk back and forth.
我想以一幅景象来描述：就像是一座桥梁从河的一岸到另一岸，在其上你可以自由前进或后退。
3.
Take two steps forward and two steps back.
前进两步，然后后退两步。
4.
In the first three beats, the dancers move forward, backward or around; while in the latter two beats, they clap their feet or hands in their original places.
前三拍或进、或退、或转身，后两拍两人在原地"对脚"或"拍掌"，
5.
crash-astern maneuver
全速前进转为全速后退
6.
Took two steps back for every step forward.
每前进一步向后退两步
7.
crash ahead maneuver
全速后退突转全速前进
8.
No retreat is allowed only advance.
只许前进，不许后退。
9.
At the same time, the system vibration also made the paired gears enter into meshing in advance or and seceding of a couple of laggingly.
同时，系统振动还使啮合齿对提前或迟后进入啮合、提前或迟后退出啮合。
10.
Insert a link bar or back and next link bar based on the navigation structure of this web site.
基于此网站的导航结构插入链接栏或后退/前进链接。
11.
Retreat of a military force in the face of enemy attack or after a defeat.
撤退面对敌军进攻时或失败后的军事撤退
12.
In proportion as the cabriolet advanced, he felt something within him draw back.
车子越前进，他的心却越后退。
13.
Instead of pressing forward, they drew back.
他们不仅没有前进，反而后退了。
14.
Events have moved forward,let us not put the clock back!
时局已经前进了，不要把它拉向后退。
15.
He distinguished the choice open to him of forward or back.
他还权衡着他究竟应该前进还是后退。
16.
The enemy were withdrawing as our army moved forward.
我军向前推进，敌人正在后退。
17.
To see a list of the last few pages you visited, click the small down arrow beside the Back or Forward button.
要查看刚才访问的网页列表，请单击“后退”或“前进”按钮旁边的向下小箭头。
18.
The act of withdrawing or going back.
后退撤回或退回的行为