1. You must retrace your steps. 
   你必须折回原来走过的路；你必须重来一次。
2. a tool used to bend each alternate sawtooth at a slight angle outward. 
   用来把每个交替的锯齿向外分出微角的一种工具。
3. To go back over(one's course); retrace. 
   折回（走过的路）；返回
4. important for human and animal food; growth habit and stem form similar to Indian corn but having sawtooth-edged leaves. 
   人类和动物的重要食物；生活习性和茎的形状类似于印度玉米但具有锯齿状边缘的叶子。
5. My leader also stopped, and was so kind as to allow me to retrace my steps. 
   和善的夫子同我站在一块不动，而且允许我往后退回一些。

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