英 [ˈdʌbl bæk] 美 [ˈdʌbl bæk]
折返：返回原路并折返。
double back //
动词 to go back in the opposite direction (esp in the phrase double back on one's tracks) (尤指用在词组"double back on one's tracks"中)沿原路返回
循原路折回；往回逃跑；把…对折-引用次数：6
... commuter train市郊往返列车 double back把。。。对折;往回跑 go up to前往 ...
... double agent (为敌对双方服务的)双重... double back 对折 double bass 低音提琴 ...
12、双背(double back)绑法 虽然相当难系上，但此种绑法相当有趣、牢固，也便于缩短过长的鞋带。
循原路折回；往回逃跑；把…对折
It ruins a book to double back the pages as a bookmark.
把书页折起来当作书签用会把书弄坏的。
As it grows outward, it runs out of room and is forced to double back into a horseshoe shape.
随着它向外生长，空间扩大，增大为以前的两倍，成了马鞋的形状。
Whether you need to double back and revisit some old code, write some more test cases, or even delay a deadline — do it.
不管是否需要你回顾还是重新查看一些旧代码，都要多写一些测试用例，甚至推迟截止日期也要这么做。
Concerns about a double-dip recession were back in the news this week.
VOA : special.2010.07.02
I just come back with my black coffee and my double espresso mocha latte skinny frothed, except it isn't espresso.
我回到桌位上，双手拿着我的黑咖啡,和一杯双倍浓度无咖啡因少泡沫的穆哈咖啡，其实不是无咖啡因的。
心理学导论课程节选 : 耶鲁公开课
It's a double stranded circular piece of DNA, meaning that the 3', 5'ends that hang off are joined back together again to form a continuous loop.
它是双链环状DNA,它的3'末端和5'末端首尾相连,构成一种连续环状结构
生物医学工程探索课程节选 : 耶鲁公开课
Travelers can now reach the edge of Nicaragua's map without having to double back to get home if they make their plane.
Someday, the United States will probably have to double back and do something for the hard cases showcased in the Senate hearings on the DREAM bill.
Specifically, the Act provides an independent cause of action for a whistle-blower who has experienced employer retaliation, which allows the whistle-blower to recover double back pay with interest and attorney fees.