There is a constant shuffling, as potential energy is transformed into kinetic or elastic energy, and then back again.

能量经常在我们身体里转来换去，从势能转为动能或弹性能，然后再转变回来。

youdao

He change verb tenses every time he talked about something. He kept shifting from the past to the present and then back again.

当他说到某事的时候，讲的动词时态都不一样，从过去时到现在时，再转回去。

youdao

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。

youdao

"It's definitely a relief to us who lives in here because of what's happening, when everything is over we will be able to go back to Haiti without worry, with knowing OK, without nothing bad happening, we'll feel like we're safe over there and then come again back to America safely."

VOA: special.2010.02.01

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

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

It is weakly overseen without an independent audit and thus is able to intermediate the transformation of bad, illiquid assets into money (and near money) and then back again into valuable financial assets, all done secretly and anonymously.

FORBES: Is The Federal Reserve Using Money-Laundering Techniques To Cleanse Banks' Balance Sheets?

NATO, and then back again.

ECONOMIST: Another chapter opens in Kosovo