"We saw this fish pounce a couple of times," says photographer Tim Laman. "His mouth shot out and back in a fraction of a second."

“我们见过这只鱼的数次突袭。”摄影师蒂姆·雷曼说。“它的嘴一开一合仅需一瞬间。”

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Paging a memory block out and back in from disk is significantly slower than accessing it directly from RAM, so you should generally avoid this practice.

与直接访问RAM中的内存块相比，把内存块交换到磁盘并交换回来要慢得多，所以一般情况下应该避免这种做法。

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I stood in the driveway and watched him back out and pull away.

我站在车道上，看他把车倒出来然后开走了。

《柯林斯英汉双解大词典》

With the furs on his back, and his gun in his arms, he stepped out on the fallen tree.

VOA: special.2010.06.26

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

And the boy uses the trees to do two things, right: to go up, or go out, and come back, to return.

这个孩子用树做了两件事：,上去，出去，回来，落下。

耶鲁公开课 - 现代诗歌课程节选

He pushes 375 pounds out and back ten times in a row, rests three seconds and does it again.

FORBES: Magazine Article

Women frequently opt in and out and back from paid work.

CNN: Non, the French are not better moms

Our test ride was short, just out and back with a U-turn and a few stops in the middle, but it was enough to leave us impressed -- especially since Nissan believes it could have the system in production cars by 2015.

ENGADGET: Nissan NSC-2015 self-driving car with LTE and smartphone connectivity (test-ride with video)