Years of experience have afforded him the chance to detect little-known warning signs and symptoms like the four he addresses.

多年的经验让他有机会观察到很难察觉到的示警标志和症状，就像他强调的那四种。

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For four centuries, he says, foreigners have ruled Angola.

他说4个世纪以来外国人一直统治着安哥拉。

《柯林斯英汉双解大词典》

He then proceeded to teach himself geology, and when he was twenty-four, he went to work for the company that was excavating the Somerset Coal Canal in the south of England.

后来，他又自学了地质学；24岁的时候，他开始为那家挖掘英格兰南部的萨默塞特煤炭运河的公司工作。

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In nineteen forty-four he began work on a project in Mexico financed by the Rockefeller Foundation.

VOA: special.2009.09.22

In a help session what he might do typically is solve between four and eight problems that illustrate the key principle being talked that week.

在帮助课程中他一般会,解决4到8个问题,来阐明那一周教的关键原理。

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When World War One began he was seventy-four.

一战开始的时候他已经七十四岁了。

耶鲁公开课 - 现代诗歌课程节选

At age four he could hold a 7-pound barbell in each outstretched hand, according to the New England Journal of Medicine.

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Balotelli's first Premier League goals in November 2010 were overshadowed by a red card, the first of four he would go on to receive during his City career.

CNN: January 31, 2013 -- Updated 1247 GMT (2047 HKT)

For four years he presented Start the Week on Radio Four before deciding that he didn't like getting up that early in the morning.

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