Think of some things that go to and fro.

想想那些来回往复的东西。

Sunday, we start the cycle all over again.

周日 再开始往复。

And it's a cycle that goes around.

这就是一个，往复。

The characters are barely there. The dialogue goes in circles.

也几乎没有人物 对话往复。

And so the cycle spirals downward until you're both gone.

就这样往复，直到你们都消失。

No more powerful first experiences and life repeats itself over and over.

没有更强大的初次体验，生往复。

And so on and so on and so on, made you day in an upward spiral.

往复，你这天就会越越好。

This in turn provokes more exits, and so on.

这反来又会引发更多的，往复。

But if it takes off, it could help close the loop on trash.

但如果这成功地启动了，它将会有利于切断垃圾的往复。

Evolution, in fact, is a constant back and forth between the environment and its inhabitants.

事实上，进化是境和其居住者之间的一种不断往复的程。

But then you've got to go all the way to those classes, do the classes, come home again.

但是然后呢你需要去参加课程，然后回家，往复。

However, there won't actually be any changes, continuing the cycle of mistreatment and manipulation.

然而，实际他们上不会有任何改变，而是继续对你施行虐待和操纵，往复。

When we help ourselves, we help others. And so on and so on. So they were pro-social.

当我们帮助自己时在帮助他人 往复 所以他们都是利社会者。

The 14th-century historian Ibn Khaldun believed that history occurs in cycles over four generations.

14 世纪的历史学家伊本·赫勒敦认为，历史在四代人之间往复。

For scientists, the inter-connected web-like filaments offer a clue as to the nature of life itself.

对于科学家来说，这种相互关联、往复的结构也是生命的本质。

After it came to Earth, that water has been cycling through rocks, air, animals, plants and back again.

在它到达地球后，水在岩石、空气、动物、植物中往复。

And the people looked up from their day-to-day tasks, their day-to-day jobs and their day-to-day masks.

人们从日复一日的任务，周而复始的工作以及往复的口罩中抬头观望。

There's been lots of images on social media of collapsed buildings, swimming pools moving with water back and forth.

社交媒体上有很多倒塌建筑的图片，游泳池中的水也在往复流动。

Otherwise, depart again, continuing until the next lit candle, testing if it's your starting one, and so on.

否则就再出发，直到下一支点亮的蜡烛，验证它是不是起始蜡烛，如此往复。

In the case of a love-hate relationship, a couple just keeps going back and forth between the two feelings.

在爱恨加交的关系里，两人不停地在" 爱" 与" 恨" 间往复。