You might experience a flipping back and forth, from one to the other, then back again, when you stare at the picture.

也许你凝视图像的时候，不断看到它从一个跳到另一个，然后再跳回来。

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This is necessary because the user may have added items to the Cart and then refreshed the page or navigated away and then back again.

这是必需的，因为用户可能已经向Cart中添加了商品，然后刷新了页面或者导航到其他地方之后又返回来。

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Bipolar disorder causes dramatic mood swings from overly "high" and/or irritable to sad and hopeless, and then back again, often with periods of normal mood in between.

双相情感障碍导致激烈地在过分地高亢和/或易怒到悲伤与无望之间反复的情感波动，同时，常常有一个平稳的间歇期在两者之间。

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But then the Union soldiers came back again.

VOA: special.2009.11.05

It would go out of his sight, and then it would pass again going back down to the table.

会飘落到上面，时隐时现的，“

耶鲁公开课 - 1945年后的美国小说课程节选

You've got to pretty much take that chalk, and make a slurry out of it, put water, and dry it back up, put in a mold, and then you can have the chalk again, but you can't just glue it back together.

你得尽可能地收集它的碎片，把它做成粉浆，加水然后风干，放进模具，然后你就能重新得到这支粉笔，但是你不能简单地把它粘起来。

麻省理工公开课 - 热力学与动力学课程节选

So he understands the perils of quickly rising from modest means to riches -- then back again.

CNN: The end game: How sports stars battle through retirement

Toying with the third button of his dungaree shirt, he turned his gaze toward the pine trees outside and then back again to his father.

NEWYORKER: Town of Cats

Smells like orange gasoline, then creme brulee, then back again.

FORBES: A Sotheby's Tasting Before A Big Auction