One single slip brings eternal regret, and looking back, your whole life has passed away.

一失足成千古恨，再回头已过百年身。

《新英汉大辞典》

And looking back on it now, with a more clear head, I get it.

现在头脑清醒了再回头想想，我明白了。

youdao

And looking back, we cannot know the precise time and place that it all went wrong.

如果回头看，我们却不知道事情开始出错的确切时间和地点。

youdao

Kyle says,"I met a lot of artists, greats like Dizzy Gillespie and Sarah Vaughan, and looking back on that, I can see how much the musicians I met there influenced my career."

VOA: standard.2010.04.16

And then I could put a couple of plates and I could raster the beam so that when I am looking here,the beam goes back and forth about 80 times a second.

然后我放了两个感光片,我可以检测到光束所以,当我观察时,电子束以每秒80次的速度来来回回了。

麻省理工公开课 - 固态化学导论课程节选

When I am looking at that wall, its photons are hitting the wall and coming back to me.

当我盯着墙看的时候，光子撞击墙面,又回到我眼中来。

麻省理工公开课 - 固态化学导论课程节选

And looking back, it's remarkable how much Thatcher was willing to risk in a fight lesser statesmen would as soon have skipped.

WSJ: Review & Outlook: Not for Turning

When people flirt, they play an age-old game of looking away and looking back, giving fleeting glances, making a game of their attention.

FORBES: How Can You Tell If Someone Is Interested? Body Language Quick Takes #6

And it was a really exhilarating experience and looking back, Im sure throughout my life it'll be a very important two years of my career.

NPR: The Pressures Of Working In The White House