The leaders are expected to discuss a number of key issues, including European commitments on fighting climate change, ahead of a December climate change summit in Copenhagen.

VOA: standard.2009.10.27

Now the last thing is that because the neutron has no net charge, we can change neutron number.

现在，最后一件事是,因为中子没有净电子，我们可以改变中子数。

麻省理工公开课 - 固态化学导论课程节选

Possibility number two is the facts change your behavior by giving you a reason to behave differently.

第二种可能是事实改变了你的行为,通过给了你一个改变行为的理由。

耶鲁公开课 - 死亡课程节选

She hopes a unique identity number may change that.

VOA: standard.2009.09.24

It's a closed system, so the number moles doesn't change.

这是一个封闭系统，因此摩尔量不会改变。

麻省理工公开课 - 热力学与动力学课程节选

If we don't address the challenges of climate change an increasing number of nations and their peoples will be pushed into poverty never has there been a greater call for global solidarity,".

VOA: standard.2009.09.01

I can change the number of seconds that it does it.

我能改变它显示的秒数。

哈佛公开课 - 计算机科学课程节选

But in an economy that has lost jobs for 23 consecutive months, Hall noted that long-term unemployed continued to grow, rising by 293,000 to 5.9 million, with little change in the number of Americans employed part-time but seeking full-time work.

VOA: standard.2009.12.05

So, there are 2 different things that we can compare when we're comparing graphs of radial probability distribution, and the first thing we can do is think about well, how does the radius change, or the most probable radius change when we're increasing n, when we're increasing the principle quantum number here?

当比较这些径向概率分布图,的时候，我们可以比较两个东西，第一个就是考虑当我们增加ｎ,当我们增加主量子数的时候，半径怎么变，最可能半径怎么变化？

麻省理工公开课 - 化学原理课程节选

A Royal Society research team member, Jules Pretty, says the team took into account a number of changes that are expected in coming decades, such as climate change, massive rises in world population, and new consumption patterns.

VOA: standard.2009.10.21

If X is the number of cells, then the rate of change of X, dX/dt, the rate of change of the cell population, how fast division is taking is proportional to the number of cells I have.

如果X是细胞数目,那么X的改变率就是dX/dt,就是细胞数目的改变率,分裂的速度有多快,和细胞数量呈比例关系

耶鲁公开课 - 生物医学工程探索课程节选

The sum of path number 2 and path number 3 get me to the same place, so the energy change by going through this time path, this intermediate point here back all the way to final state should be the same the red path.

而经过路径2和3可以3,到达同样的末态，因此经过路径,2和3带来的能量的变化，与路径1带来的,能量变化相同。

麻省理工公开课 - 热力学与动力学课程节选

These facts about the number 3 will never change.

这些关于3的事实永远不会变。

耶鲁公开课 - 死亡课程节选

Nothing that happens here on Earth can change or alter or destroy the number three.

在地球上发生的任何事都不能,改变或者消灭数字"三"

耶鲁公开课 - 死亡课程节选