In the early spring three decades ago, Mount St. Helens began to rumble.
在三十年前的早春，圣海伦斯山开始轰鸣。
Advances in technology might make Antarctica a lot more accessible three decades from now.
科技的进步可能会让三十年后的人们更容易到达南极洲。
The percentage of retirement-age people in the labor force has doubled over the past three decades.
过去三十年来，退休年龄人口在劳动力中的比例翻了一番。
Over the past three decades, the industry has made some efforts to improve the quality of its offerings.
在过去的三十年里，这个行业为了提高其产品的质量做了一些努力。
It has consequences: South Africa's ongoing drought—the worst in three decades—will cost at least a quarter of its corn crop this year.
它的后果是：南非持续的干旱——三十年来最严重的干旱——将导致它今年至少四分之一的玉米作物受损。
A new data shows that the global AIDS pandemic will cause a sharp drop in life expectancy in dozens of countries, in some cases declines of almost three decades.
一项新的数据显示，全球艾滋病疫情将导致数十个国家的预期寿命大幅下降，在有些国家寿命减幅近30年。
Over the past three decades, the number of students leaving home each year to study abroad has grown at an annual rate of 3.9 percent, from 800,000 in 1975 to 3.5 million in 2008．
在过去的30年里，每年出国留学的学生人数以每年3.9%的速度增长，从1975年的80万人增长到2008年的350万人。
For three decades REM evolved.
REM三十年来不断变化。
In the past three decades their Numbers have doubled.
在过去30年中，他们的人数翻了一番。
Outbreaks are a much larger menace today than they were just three decades ago.
疾病的暴发如今比在三十年前更具威胁。
Per capita food grain availability has shrunk to what it was three decades ago.
人均粮食拥有量比三十年前还少。
That has been the story of parts of the Third World over the past three decades.
这已经在过去的三十年间在部分第三世界国家一再上演。
Maybe after two or three decades, I'll have more readers, but it's too early now.
也许20年或者三十年后，我会有更多读者，但现在还是太早了。
This week shares in Hitachi and NEC fell to their lowest levels for three decades.
本周日立和NEC的股票都创下三十年来的新低。
Over three decades he built the business from $2 million in sales to $300 million-plus.
在三十年中他将公司销售量从200万美元推上了3亿多美元。
Four other federal inquiries held over the past three decades have failed to halt the decline.
在过去三十年里，其他四次联邦调查都无法阻止这个下降趋势。
Last year it had just 44 cases of polio, down from an estimated 250, 000 three decades ago.
该病从30年前的约25万例下降至去年的仅44例。
Psychological research over three decades demonstrates the power of Stimulus Control Therapy.
三十余年的心理学研究证实了刺激控制疗法的威力。
It all began more than three decades ago when Lovelock devised the electron-capture detector.
这一切是从超过30年前Lovelock设计了一个电子捕捉探测仪开始的。
But in the past three decades this subtle musical voice has grown quieter and quieter. Until now.
但在过去的三十年中，这种不可思议的美妙音乐趋于销声匿迹——直到现在。
Another two or three decades and Michael might have the most impersonators from Bangkok and Brazil.
再过个二三十年，从曼谷到巴西，迈克尔可能会拥有最多的模仿者。
NO COUNTRY in history has sustained such a blistering rate of growth over three decades as China.
历史上没有哪一个国家的经济能像中国一样，30多年来一直保持如此高的增长率。
In his more than three decades as an examiner, he had never seen a set of fingerprints like this.
作为一名从业超过30年的指纹检验师，他从来没有见过这种情况。
Researchers studied three decades of Major League Baseball batting averages and play-by-play data.
研究人员研究了过去30年职业棒球大联盟击球平均值和实况统计数据。
The report shows "unequivocally that the world is warming and has been for more than three decades".
该报告表示“毫无疑问，世界正在变暖，而且已持续30多年了。”
The report shows "unequivocally that the world is warming and has been for more than three decades".
该报告表示“毫无疑问，世界正在变暖，而且已持续30多年了。”
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