You can back up another two feet or so.(你可以再退两英尺左右。)
I managed to pull everything back up.(我设法挽回这一切。)
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。)
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。)
Clogged pipes caused drain water to back up into the room.(水管堵塞，排出去的水倒灌入室。)
You should back up your data often.(你应该经常备份你的数据。)
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。)
That sort of attitude really gets my back up!(那种态度实在叫我恼火！)
"Back up," I said softly.(“退回去，”我轻声地说。)
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。)
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