Over billions of light years and looking back billions of years in time, we now know that the fine-structure constant hasn't changed any more than about .001 percent.

在那几十亿光年以外的地方，回头看数十亿年时间，我们现在知道，这个精细结构常数并没有任何超过1/100000。

youdao

Looking back over the past two years, he also owned land in the planting before, they worked can be harvested only withered grains.

回想起过去的两年中，自己也曾在所拥有的土地上播种过、耕耘过，可收获的却只有干瘪的谷粒。

youdao

Looking back over the past ten years, I have the greatest impact to the people is my mother.

回首过去的十一年，给我影响最大的人无疑是我的母亲。

youdao

Looking back over the last ten years what was the most inspiring sight and what was the worst sight, the most distressing, the most inhuman sight you encountered?

BBC: News Online

Looking back over the past 40 years, February was one of the two months that showed a loss, but it was considerably better than September, which was the worst month.

FORBES: Are You Ready for a February Surprise?

Aron Cramer: Looking back over the last 20 years we see very positive developments: poverty has been reduced, more and more companies have stated commitments to sustainability, energy efficiency has improved, and consumers have access to a lot more information.

FORBES: Why Has Corporate Social Responsibility Stalled?