正向/反向 D/R Direct/Reverse
正向-反向电子解算器 forward-inverse electronic resolver
正向或反向的 direct or reverse
反向正向计数器 backward forward counter
正向回路反向跳跃 forward loop backward hop
因此，帧在时间上是反向播放还是正向播放，取决于按下了哪一个鼠标按键。
As such, consider making the frames play backward or forward in time depending on which button was clicked.
在返回的途中，反向路径变成正向消息路径。
On the return trip, the reverse path becomes the forward message path.
创建了正向和反向查找区域后，重新启动系统。
Reboot the system after the forward and reverse lookup zones have been created.
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