You can back up another two feet or so.(你可以再退兩英尺左右。)

I managed to pull everything back up.(我設法挽回這一切。)

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.(讓我們再次倒退，回到19世紀60到80年代，來多談談女性藝術課上發生了什么。)

In this article, you need to back up the general statement with specific examples.(在文章中，你需要用具體的例子支持總的觀點。)

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.(你應該經常備份你的數據。)

If we go back up to the kinds of data objects we started with, floats, ints, strings, they actually behave the same way.(如果我們回想一下我們一開始講過的數據對象的種類，浮點數，整數，字符串，它們實際上有相同的行為方式。)

That sort of attitude really gets my back up!(那種態度實在叫我惱火！)

"Back up," I said softly.(“退回去，”我輕聲地說。)

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，在殘疾人賽事上賽滑雪。)