In 2015, the US Forest Service for the first time spent more than half of its $5.5 billion annual budget fighting fires—nearly double the percentage it spent on such efforts 20 years ago.

2015年，美国林务局首次使用55亿美元年度预算的一半以上用于灭火——这几乎是20年前火灾支出所占比例的两倍。

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Half of the Eurozone is already experiencing a double dip recession.

一半的欧元区已经经历过双重衰退。

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Can the industry really double again in half the time?

奢侈品业是否真的能在一半的时间内再次翻番？

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Despite what he calls overblown fears of a double-dip recession, Cardillo predicts the U.S.economy will grow between two and a half to three percent for the second half of the year.

VOA: standard.2010.07.20

If it goes on for ten years that means that the -it'll double in seven years, so it'd be going up like two and a half fold.

如果按照此速度过上十年就意味着,七年内价格将会翻倍,所以价格应该会上涨到两倍半

耶鲁公开课 - 金融市场课程节选

So, our two glitches we see when we go from the 2 p, or from 2 s to start filling the 2 p, and then we also get another glitch when we've half-filled the 2 p, and now we're adding and having to double up in one of those p orbitals.

因此，我们的看到的两个小偏差，一个是在开始进入，2，p，轨道，或者说在填满，2，s，轨道之后,开始填，2，p，轨道的时候出现的，另一个则是在，2，p，轨道半满之后,开始继续加电子，使得其中一个，p，轨道上的。

麻省理工公开课 - 化学原理课程节选

The Dons came from 2-1 down to defeat the plucky Fifers 3-2, thanks to Scott Vernon's second half double.

BBC: Aberdeen manager Mark McGhee relieved at Cup recovery

Striker Alvaro Negredo scored all four goals for mid-table Sevilla as visiting Valencia dropped to fifth place despite a second-half double from forward Roberto Soldado.

CNN: Cup win clinches Bayern's historic treble

Ferguson praised Cristiano Ronaldo, whose first-half double took him to 40 for the season and left him just one adrift of Alan Shearer's 31-goal Premier League record.

BBC: Ferguson piles stress on Chelsea