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1·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。

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·If you double back the blanket, it will be more comfortable.

如果把毯子叠起来会更舒服。

4·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。

5·The roads leading to the most beautiful places always twist and turn and double back on themselves.

通往最美丽的地方的路总是曲曲折折而且有时候不得不返回起点。

6·Add a fixed roll based on the single back rest system, forming a double back rest system, then analysis.

并在此单后梁系统基础上，加设一固定后梁，组成双后梁系统，对其进行分析计算。

7·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。

8·Whether you need to double back and revisit some old code, write some more test cases, or even delay a deadline — do it.

无论你是否需要后退两步复查一些老代码，写更多的测试用例，或者甚至是推迟一个截止期限——做下去。

9·One has to rush to work in the morning and double back home at night, fighting one's way through crowds and traffic snarls.

人们急于上班和双重回家，晚上，一个战斗的方式，通过群众和交通。

10·As a kid on Halloween, did she double back and trick-or-treat at the same house twice because they gave out full-size Baby Ruths?

在她小时候，有没有在万圣节玩“不招待就使坏”的时候为了一块鲁斯宝宝糖两次到同一个人家？