BBC news 2010-07-16 加文本

Two United Nations reports say China took the lead after opening new wind farms that produce as much electricity as 20 coal-fired power stations.

倍数比较

“翻一番”或“为…的两倍”。3倍常用three times, triple, threefold表示，译为“增加2倍，增至三倍”或“为…的3倍”。4倍用

quadruple，基数词＋times，基数词＋fold表示，译为“增加3倍，增至4倍”或“为…的4倍”。例如：

  He earned double the usual wage in holiday. 他在假期里挣了比平时多1倍的工资。

 This bridge is as long again as that bridge. 这座大桥的长度是那座大桥的2倍。

  They have produced four-fold as many laptops as they did last year.他们今年生产的笔记本电脑相当于去年的4倍。

Their grains have trebled (tripled) this year. 他们的粮食今年增加了2倍（是…的三倍）。

1) 主语+谓语+ X times + as + adj. + as
这个句型译为：① A…是B的X倍（或净增加X－1倍）.
例如：This pen (A) is twice as expensive as that pen (B).
这只钢笔(A)的价格是那只钢笔(B)的2倍。（即A比B贵一倍）
I have three times as many as you.　我有你三倍那么多。（我的比你的多两倍）
 This box is four times as heavy as that box. 这个盒子比那个盒子重4倍。

2）主语+谓语+ X times+ the size (amount, width, breadth, level, value, velocity, length…) of…
  这个句型表示净增加“1倍，是…的2倍”例如：
 The earth is 49 times the size of the moon.　地球是月球大小的49倍。
 
3）主语+谓语+ X times + 形容词（副词）比较级+ than…
  这个句型表示的数为净增加数。例如：
 The grain output is one time higher this year than that of last year.
　今年比去年粮食产量增加一倍。
 
4）还可以用by+倍数，表示增加多少倍
　The production of grain has been increased by four times this year.
　今年粮食产量增加了4倍。