There is no emergency back-up immediately available.
没有立即就能获得的后备。
Homes lacked back-up power generators.
家里也没有备用的发电机。
You can back up another two feet or so.
你可以再退两英尺左右。
That sort of attitude really gets my back up!
那种态度实在叫我恼火！
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。
Other actions can be taken to back up the policy.
可以采取其他行动来支持该政策。
Whatever you say, he/she can find 10 different reasons to back up his/her viewpoint.
不管你说什么，他/她总是能找出10条不同理由来支持他/她的观点。
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。
But as soon as the fever goes down, it's soon back up again.
但是，体温降下来不久后，它很快再度回升了。
In this article, you need to back up the general statement with specific examples.
在文章中，你需要用具体的例子支持总的观点。
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。
I managed to pull everything back up.
我设法挽回这一切。
I hit the ground and bounced back up.
我撞到地上，弹了回来。
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。
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。
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。
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