Four of the "Big Five" events unfolded on scales estimated at hundreds of thousands to millions of years, inflicted in the main by naturally-caused global warming or cooling.

据估算，五次大灭绝中的四次是在在几十万年和几百万年间进行的，而且都是因为自然的全球变暖和变冷。

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By early yesterday, the insurgents had taken control of the country's main military air base.

到昨天早些时候，那些起义者已控制了该国的主要空军基地。

《柯林斯英汉双解大词典》

The old stone cattle trough still sits by the main entrance.

那尊古老的石制牛食槽依旧位于主要入口处。

《柯林斯英汉双解大词典》

When the top of the main shoot is removed by pruning or breakage the auxin is no long produced.

VOA: special.2009.10.06

So you have three main trade routes that cross the country, and they were used by trading caravans that would carry gold and grain and spices and textiles and other goods between Egypt and the rest of the Fertile Crescent and up into Asia Minor.

你有三条主要道路穿过这个国家，他们被通商的车队所使用,驮着金子，谷物，香料，纺织品和其他货物,在埃及与其他肥沃的伊斯兰教国家间,向上到达小亚细亚。

耶鲁公开课 - 旧约导论课程节选

Of course, other stocks are held by institutions on their behalf, but in terms of direct ownership, homes are the main thing that people own.

当然,他们还通过金融机构,间接持有股票,但从直接持有的角度来看,人们拥有的主要财产就是住宅

耶鲁公开课 - 金融市场课程节选

Europe's chief economic problems high unemployment and slow growth are caused in the main by high taxes, unduly burdensome regulation and excessive (which means both expensive and ineffective) public spending.

ECONOMIST: Europe��s new economics

Engineers had isolated the large water main by 1730 BST.

BBC: People evacuated after pipe bursts in Huyton

Though anecdotes abound of candidates being vetted by party operatives, the main means by which the Conservative government ensured that quango boards were broadly sympathetic was a legitimate one: they asked the appointments panels to seek people with business experience.

ECONOMIST: Who��s really who | The