It cannot be changed. The expression comes from the idea that water that has fallen over a dam cannot be brought back again.

VOA: special.2009.05.10

So, you know, it has changed a lot since, I guess, over the last ten years or so,

所以，大概是在过去的十年里，我想，它变了很多，

关于有机农场食品 - SpeakingMax英语口语达人

It's helped some countries and hurt other countries, but it certainly has changed the food landscape.

这让某些国家获利,但却损害了另外一些国家的利益,但这显然改变了食品所能涉及的范畴

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

But the secretary also said senior officials are aware that past efforts have failed, and he said it is not clear whether the view in Tehran has changed.

VOA: standard.2009.05.05

There are so many ways in which that has changed the world, but I can't do justice to it but Hanson does, so if you want to read, fields Without Dreams, you can ponder the significance of this great change.

有太多改变这个世界的因素了,我很难全部都客观地讲出来,但是汉森可以,你可以在《遗梦之野》中有所了解,你可以仔细琢磨这些伟大的变革

耶鲁公开课 - 古希腊历史简介课程节选

"It has been a tour where we have seen things changed,".

VOA: standard.2009.10.12

The other one is a committed progenitor cell that now somehow has been changed in such a way that it's going to mature and develop into non-stem cells or the cells that make up our bodies, somatic cells.

而另一个子细胞就通过某种变化,成了定向的祖细胞,并将成熟和发育为非干细胞的细胞,就是构成我们身体的细胞,体细胞

耶鲁公开课 - 生物医学工程探索课程节选

The United States has recently changed its Burma policy from isolating the military government to direct engagement in hopes that it will improve its human rights and allow for democracy.

VOA: standard.2009.11.08

So is this, but it has that whole like Jim Morrison, Jimi Hendrix feel, hasn't changed at all.

整个有一种吉姆·莫里森，吉里·亨德里克斯的感觉，一点都没变。

圣莫妮卡的海滩 - SpeakingMax英语口语达人

In his commencement address, President Obama told the cadets he believes the nature of the war in Afghanistan has changed since it began in 2001, but that it is no less important today.

VOA: standard.2010.05.22

You can imagine that there are many requirements that a device like this has to meet in order for it to be a good artificial hip and we'll talk about those and how the design of these has changed over the years and what we can expect in the future.

你可以想象,这种装置对技术要求极高,这样它才能成为,一个好的人工髋关节,我们会讲到这些,以及这些年来这项技术的设计有哪些改进,在未来会有怎样的创新

耶鲁公开课 - 生物医学工程探索课程节选

she says she has witnessed great change - much of it good But she noted that many important things have not changed, including the aims and values that inspired the United Nations Charter.

VOA: standard.2010.07.06