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。
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。
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。
Now, looking back over those four years, I can't imagine how the time went by.
现在，回头看过去这四年，我真无法想象时间过得这么快。
Looking back over the past years, have you ever experienced any of these things?
回想过去，这些事你曾经历过么？
In looking at all of the back and forth over the years, I have two observations.
在后并提出这些年来，请寻找在我有两个观察值。
Looking back over the past ten years, business, Mr Yu said the first thought is to regret doing the new East So much.
回首过去的十几年创业，俞敏洪表示首先想到的是后悔把新东方做这么大。
Now, looking back over those four years, I can't imagine how the time went by so quickly.
现在，回头看过去这四年，我真无法想象时间过得这么快。
Now, looking back over those four years, I can't imagine how the time went by so quickly.
现在，回头看过去这四年，我真无法想象时间过得这么快。
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