例1．实现了千百年来围湖造田、与湖争地到大规模退田还湖的历史性转变。
This represented a great shift from the centuries-long history of reclaiming farmland from lakes to restoring it to them on a large scale.
本文就是针对这一历史性转变，在介绍中国钢铁工业现状的基础上。
In this thesis we began to research the issue of China steel export trade from the historical change.
你们知道，美国必须在这一历史性转变时期，为所有寻求自由的人们留一盏明灯。
You see, America must remain a beacon to all who seek freedom during this period of historic change.
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