这已经在过去的三十年间在部分第三世界国家一再上演。
That has been the story of parts of the Third World over the past three decades.
在过去的三十年间，美国海域里超过490个石油钻井平台已经转变成珊瑚礁了。
More than 490 platforms in American waters have become reefs in the past three decades.
依据国家健康研究院的调查，在过去的三十年间美国体重超标的儿童数量已经加倍。
According to the National Institutes of Health, the number of children who are overweight in the United States has doubled during the past three decades.
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