As a result, they have lost the parachute they once had in times of financial setback—a back-up earner (usually Mom) who could go into the workforce if the primary earner got laid off or fell sick.
因此，它们已经失去了在经济萧条时期曾经持有的“保护伞”——一个后备挣钱者（通常是母亲），她可以在主要挣钱者失业或者病倒的时候出去工作。
Homes lacked back-up power generators.
家里也没有备用的发电机。
Some SIVs had back-up banking facilities; some did not.
一些SIV有银行支撑，一些没有。
One final note, keep an updated back-up of everything on your website.
最后一个注意事项就是，定期备份你网站上的所有内容。
She invoked several eminent scholars to back up her argument.
她援引了几位赫赫有名的学者来支持她的论点。
He's now back up on the slopes again, skiing competitively in events for the disabled.
他如今又回到了滑坡上，在残疾人赛事上赛滑雪。
Radio signals received from the galaxy's centre back up the black hole theory.
从该星系中心接收到的无线电信号证实了黑洞理论。
The writer doesn't back up his opinions with examples.
作者不用实例印证他的看法。
First let me back up a bit and talk about vision correction before the printing press.
让我先回顾下在印刷术之前的视力矫正是什么样的。
Let's back up again and talk about the time period from the 1860s to the 1880s and talk more about what happened in women's art classes.
让我们再次倒退，回到19世纪60到80年代，来多谈谈女性艺术课上发生了什么。
If we go back up to the kinds of data objects we started with, floats, ints, strings, they actually behave the same way.
如果我们回想一下我们一开始讲过的数据对象的种类，浮点数，整数，字符串，它们实际上有相同的行为方式。
Furthermore, one sensory ability may back up another.
此外，一种感知能力可能会为另一种感知能力提供支持。
I hit the ground and bounced back up.
我撞到地上，弹了回来。
Now, look back up at the section here, where you wrote about Dewey's view of individuality.
现在，回头看看这一节，你在这里写了杜威的个性观。
Every few steps he stopped to pull his trousers back up because he didn't have a belt.
他每走几步就停下来提提裤子，因为他没有皮带。
This is just sort of bringing us back up to speed and adding a few more details in.
这只是让我们跟上进度，增加一些细节。
He used all his strength to raise the tree back up again, and look after it until it completely recovered.
他用尽所有的力气把树扶起来，并照顾它，直到它完全康复。
As soon as the driver puts the car in gear and touches the gas pedal, the engine starts back up.
司机一挂上挡，踩下油门踏板，发动机就重新启动了。
The weight of the ball causes the dragon's head to move down and the dragon's tail pulls the water bowl back up.
球的重量使龙头向下移动，龙尾将水碗拉起来。
"It might take the monarchs as many as four to five generations to complete the journey all the way back up to Canada," says Sarina Jepsen, who directs the endangered species program for the Xerces Society.
“完成返回加拿大的整段旅程，帝王蝶可能会经历四到五代。”薛西斯戈灰蝶协会濒危物种项目的负责人萨琳娜·杰普森说道。
Clogged pipes caused drain water to back up into the room.
水管堵塞，排出去的水倒灌入室。
Follow these steps to back up databases or table Spaces online.
按照这些步骤对数据库或表空间进行在线备份。
You should back up configuration files regularly.
应该定期备份配置文件。
We strongly recommended that you regularly back up these databases.
我们强烈建议定期备份这些数据库。
For added protection, back up the registry before you modify it.
用于添加保护之前，修改备份注册表。
Back up the managed systems partition profile data.
备份管理的系统分区配置文件数据。
Back up your original unstructured files.
备份原始的非结构化文件。
And again, don't attempt to back up your filesystem with the hope to back up your databases as well.
同样，别以为备份文件系统就可以备份数据库。
If you can't go up the hill forwards, you'll have to back up.
如果你不能往前爬上山，那你就得向后退。
If you can't go up the hill forwards, you'll have to back up.
如果你不能往前爬上山，那你就得向后退。
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