Experts say the ability to take up lead is reduced when the pH level is above six and a half.

VOA: special.2009.06.09

I just doubled the indentation each time so you can see it. So each successive call, notice what's happening. The argument is getting reduced. And we're going another level in. When we get down to this point, we're calling it with just a string of length one.

因此每次成功调用注意它的过程,我们的命题不断简化，而且我们不断深入嵌套,当我们走到这一步的时候,我们就是在调用它处理，仅有一个元素的字符串了。

麻省理工公开课 - 计算机科学及编程导论课程节选

That reduced the monthly trade deficit to the lowest level in 5 years.

VOA: special.2009.01.16

Fund Executive Director Michel Kazatchkine warned in a news release even this reduced funding level may not be sustainable unless wealthy countries and other donors increase their commitments.

VOA: standard.2009.11.15