retrace ratio

例句：

1. 2. 重新做某事
   通常指之前已经做过但需要再次完成的事情
2. 1. We decided to retrace our steps and find a new route.
   我们决定重新走一遍，找到一条新的路线。
3. 2. The old road was too narrow for the heavy traffic, so we had to retrace our steps.
   那条旧路太窄了，无法承受重车流量，所以我们不得不重新走。
4. 3. She retraced her steps to the spot where she had left her bag.
   她重新走到她丢下包的地方。