尽管在这区区3.5平方英里的皮尔森发生过那么多的历史事件，但几十年后，曾在那里长大的我和朋友们基本上对皮尔森的过去一无所知。

Despite the historic events that occurred within the 3.5 square miles of Pilsen, my friends and I, growing up there generations later, were largely ignorant of its past.

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虽然在刚开始时，研究者尚不了解任何让他们感兴趣的具体基因，但当年对数据的搜集令科学家可以在几十年后评估相关的遗传风险。

Even though specific genes of interest weren't known when these studies began, data were available that allowed scientists to evaluate genetic risk decades later.

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但放眼几十年后，河水水位将下降。

But in the longer perspective of a few decades, river water levels will decline.

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