I've done that over the course of four years in high school.
我已经在高中的时候重复这一过程长达四年的时间了。
In the course of the past ten years, great changes have taken place.
在过去的十年里发生了巨大的变化。
Of course, a lot has been accomplished in the 10 years, since our engagement there.
当然，由于我们的参与，十年之中已经做到了许多。
Ten years is just a very brief moment in the long course of human history.
在人类历史的长河中，10年只是短暂的瞬间。
Ten years is just a very brief moment in the long course of human history.
在人类历史的长河中，10年只是短暂的瞬间。
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