Bio-trade analyst at the U.N.Conference on Trade and Development Lucas Assuncao says local communities will be more inclined to preserve their flora and fauna, if they can see economic benefits from using their natural resources in a sustainable manner.

VOA: standard.2010.01.31

Down here, I've just got two things to merge, and then I've got things of size two to merge and then things of size four to merge. But notice a trade off. I have n operations if you like down there of size one.

但是n的大小是不同的，是吗？在这里我们只要合并两个元素,然后是合并长度为2的列表,接下来是合并长度为4的列表,但是观察一下之间的权衡关系。

麻省理工公开课 - 计算机科学及编程导论课程节选

And that's just a way of reminding you that we want to think carefully, but what are the things we're trying to measure when we talk about complexity here? It's both the size of the thing and how often are we going to use it? And there are some trade offs, but I still haven't said how I'm going to get an n log n sorting algorithm, and that's what I want to do today.

这只是在提醒你们我们要仔细的思考问题,但是当我们在讨论复杂性的时候,我们到底要衡量哪些东西？,是列表的大小和对其进行查找的频率吗？,这里面临一些取舍,但是我还没有说明,怎样得到一个n，log，n复杂度的排序算法,并且这是我今天想要讲的内容。

麻省理工公开课 - 计算机科学及编程导论课程节选

She said with help from the Brazilian-led U.N.stabilization force, Haiti is also making strides on domestic security, and tackling corruption and the drug trade.

VOA: standard.2009.04.14

The comments followed an overwhelming vote in the U.N.General Assembly on a non-binding resolution condemning the 47-year-old U.S.trade embargo against Cuba and urging Washington to lift the restrictions.

VOA: standard.2009.10.28

Nearly 5,000 farmers in Burkina Faso, Cameroon,Ghana,Senegal, and Sierra Leone are exporting organically-grown produce to Europe, after gaining organic and fair-trade certification with help from the U.N.Food and Agriculture Organization.

VOA: standard.2010.04.11