In January, in his State of the Union speech, President Obama promised to double exports in five years.

VOA: special.2010.07.09

Three plus five. I can take something to a power, double star, just take three to the fifth power.

+5，我也可以,求一个数的次方，例如求3的5次方。

麻省理工公开课 - 计算机科学及编程导论课程节选

The bill was passed, and within five months after the bill was passed, we had double digit unemployment for the first time.

法案顺利通过，法案通过后五个月，失业率就达到了两位数,是史上第一次。

斯坦福公开课 - 经济学课程节选

And he set a goal to double American exports over the next five years.

VOA: special.2010.01.30

Now this happens to be what we would call a linear process, because the number of times I go around the loop is directly related to the size of the argument. If I double 2 the argument, I'm going to double the number of times I go around the loop. If I increase it by five, 5 I'm going to increase by five the number of times I go around the loop.

这恰好是我们会成为,线性复杂度程序的一个例子,因为我要执行循环的次数是,和输入的参数的大小直接相关的,如果我将这个参数乘以,那么我就要将进行循环的次数也乘以2了，如果我把参数加上,那么循环的次数也要加上5了。

麻省理工公开课 - 计算机科学及编程导论课程节选

"It will double the national debt in five years and triple the national debt in 10 years.

VOA: standard.2009.03.15

"It would double the public debt in five years, triple it in ten years - the highest percentage of GDP since after World War II.

VOA: standard.2009.03.22

In a White House bill-signing ceremony Wednesday, the president reaffirmed a goal he set out early this year: to double exports of U.S.goods and services in the next five years.

VOA: standard.2010.08.11