- double back
 - 循原路折回;往回逃跑;把…对折
 
参考例子
           - 1.The escaped boy doubled back on his tracks.
 - 那个逃跑的男孩突然循原路折回。
 
- 2.The road ahead is flooded so we have to double back.
 - 前面的路已遭水淹,我们只好原路折回。
 
- 3.After walking the length of the market, just as I was about to double back, my eyes were drawn to some jade bracelets.
 - 整条街都被我逛遍了,正当我准备往回走的时候,被一些玉镯吸引住了。
 
英文解释
           - v.
 - 1.retrace one's course
 
网络释义
               - double back
 - 把…对折; 往回跑; 对折; 把...对折;
 
- double-back gear
 - 双跨轮;
 
- double wing back
 - 双边卫队形;
 
- double sliding back gear
 - 双滑动背齿轮;
 
- double overarm back-stroke
 - 双臂仰泳:;