I mean, just taking the space shuttle up and back one time is hugely expensive.

我的意思是，仅仅是发射航天飞机一次再飞回的成本就已经是天价了。

youdao

Instead, stand up and back away slowly, without looking the bear in the eyes.

相反，你应带站直，慢慢后退，千万不要直视熊的眼睛。

youdao

Their skateboards clicked against the rough concrete lip of the fountain as they flipped up and back to cheers from onlookers.

他们的滑板不断地在陡峭的滑板到上翻来翻去，在旁观者的欢呼中他们玩儿得忘乎所以啦。

youdao

The chairs tilt back so that it is easy to look up and watch a movie projected on the ceiling.

VOA: special.2009.03.11

So let me go back up here, and I'm going to comment out that region, and let's uncomment this region.

那么让我们回到这里，我会为这个区域添加注意，让我们先取消注释。

麻省理工公开课 - 计算机科学及编程导论课程节选

they got back to me and scheduled up, set up an interview with an alumni in the Jacksonville area.

他们通知我，安排一个时间，在杰克逊维尔区和一位校友面谈。

收到了录取通知书 - SpeakingMax英语口语达人

In the distance, a straggling herd of wildebeest arced up and back into the grass like dolphins leaping from the water.

BBC: The Serengeti in the off-season

That when those people around the world give expression to that, that we, the American people, will stand up and back them up even when the American administration will not.

CENTERFORSECURITYPOLICY: Monica Crowley, Mightier Pen 2012

Although other investors surely wanted to do the same thing, they were turned off because lack of assurance that Microsoft would back them up and come back to the negotiating table.

FORBES: Magazine Article