In this case, Uranium-Lead Dating was used to establish that half of the sandstone in the samples was formed at the same time the granite in the Appalachian Mountains was formed.

在这种情况下，铀铅定年法被用来确定样本中一半的砂岩是在阿巴拉契亚山脉花岗岩形成的同时形成的。

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Several times in Earth's history, rapid global warming occurred, apparently spurred by amplifying feedbacks. In each case, more than half of plant and animal species became extinct.

地球史上发生过几次迅速的全球变暖，均由扩大化的反馈作用引起，每一次，都有超过一半的动植物从地球上消失。

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However, the first chronic case took place half a century ago.

然而，第一个慢性中毒病例发生在半个世纪以前。

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The case later grew to include over one and a half million women who were current and former Wal-Mart workers.

VOA: special.2009.07.17

So while the women become self- actualized, the men can cut their handicaps in half, and everybody--Steve Case included--is happy.

FORBES: Ballancing Act

The International Court, for example, takes an average of two-and-a-half years to complete a case.

ECONOMIST: The Pinochet case

To foodies, of course, the plate is always half-empty, but in this case they may have a point.

ECONOMIST: Chinese food