The trends in Afghanistan over the last three years are generally not positive.

VOA: standard.2009.03.31

So, we can think about trends in electron affinity just like we did for ionization energy, and what we see is a similar trend.

那么，我们可以想一想电子亲和能的,周期性规律是怎样的，就像我们刚才分析电离能那样。

麻省理工公开课 - 化学原理课程节选

I'm very interested in trends,

我对流行很感兴趣。

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These trends are reported in a special issue of the Journal of the American Medical Association, entirely devoted to cancer research.

VOA: standard.2010.03.25

So this is, in effect, the backdrop in which in the American academy--influenced, - as we'll now see, by certain trends in the British academy-- arose in the thirties and in the forties.

所以实际上,这就是当时美国学术界，受英国学术界影响-,在三四十年代崛起的背景。

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However in quieter provinces Afghans see positive trends according to Sunil Pillai, who directed the Afghan Survey Project.

VOA: standard.2009.10.27

So, this means we have the general trends down, so we should be able to look at actual atoms in our periodic table and graph them and see that they match up with our trends.

那么，这表示我们已经知道了大体的规律，现在我们可以来看看周期表中的,原子的实际情况，并把它们画出来,看看是否与我们的规律相符。

麻省理工公开课 - 化学原理课程节选

In the big cities, the traditional affinity to the precious metal is waning, as trends change.

VOA: standard.2009.09.19

just empirically speaking about the Harvard students, looking the trends and statistics-- empirically speaking, Americans are the most generous people in the world.

或只是说哈佛学生，根据发展趋势和统计，美国人是世界上最慷慨的人。

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So this, in fact, is going to be our last principle that we're going to talk about in terms of periodic trends.

实际上，这将是,我们要讨论的最后一个,周期性规律。

麻省理工公开课 - 化学原理课程节选

But you actually need to keep a few caveats in mind as you do this, which is the fact that trends predict a lot of chemical properties, but they can't predict everything in terms of biological properties.

不过在你使用的过程中,需要牢记一些注意事项,那就是元素周期律可以预言很多化学性质，但是不能预言一切性质,比如生物学性质。

麻省理工公开课 - 化学原理课程节选

And there's a lot we can explain by talking about what we see in the periodic table in terms of what different trends are in grouping different elements in different spots within the periodic table.

我们可以解释很多,通过讨论元素,周期表中的内容,按照各种不同的规律,将周期表中不同位置的元素分组归类。

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