"Today,about 85 percent of the burden of chronic diseases is concentrated in low and middle income countries,".

VOA: standard.2009.05.18

I'm going to say, quite to the contrary, the positive charge is concentrated at the center in a tiny, tiny, tiny volume.

我要说的是，完全相反，正电荷集中在中心,在一个非常非常小的体积内。

麻省理工公开课 - 固态化学导论课程节选

because they're like very, um, concentrated on their work.

可能是因为他们把精力全部集中在学习工作上了。

MIT的时尚品味 - SpeakingMax英语口语达人

Using the new technology, victims' rights organizations in Guatemala hope to now examine entire cemeteries in areas where massacres were concentrated, Suasnavar says.

VOA: standard.2009.12.18

For example, sodium in our blood plasma is almost to the point sometimes of 100 millimol or that's very, very concentrated.

比如，钠在我们的血浆中的浓度,有时几乎达到了一百毫克分子,或者说非常非常浓。

麻省理工公开课 - 化学原理课程节选

But within 16 kilometers of her home live tens of thousands of cows and hogs in what are called concentrated animal feeding operations, or CAFOs.

VOA: standard.2010.05.06

They're red because they contain a special protein called hemoglobin which is very concentrated inside the cell.

红细胞的红色源于,其内部一种叫做血红蛋白的特殊蛋白质,血红蛋白在细胞内的浓度很高

耶鲁公开课 - 生物医学工程探索课程节选

For now,the battle against hepatitis B is concentrated in communities with large Asian populations.

VOA: standard.2010.07.26

It is when political functions become concentrated into the hands of again the too few hands that we risk arbitrary government and the endangerment to the liberty of the individual.

因为一旦政治职权,过度集中于,少数人的手中,我们面临的风险,便是独断政府,及个人自由的危机。

耶鲁公开课 - 政治哲学导论课程节选

They are diffuse,dispersed,spread out instead of concentrated the way that fossil energy was.

VOA: standard.2010.04.21

But he also realized that when they did hit something what they hit what unbelievably massive but also that that mass was concentrated So eventually, this is what we have come to call the nucleus of an atom.

碰到的一定是十分重的东西,而且那些质量,要聚集在非常非常小的空间内,这个就是我们称作,原子核的东西。

麻省理工公开课 - 化学原理课程节选

He says the process of sorting through those areas, which include sites around the country,but concentrated in the mountainous northern areas, will be a long and difficult one, though it is work that needs to be done in the name of the victims' families.

VOA: standard.2009.12.18

"It could be taken up by crustaceans like shrimp crabs, things like that which are the base of the food chain and that could be passed up to fish and then mammals and the toxins could be concentrated and that could be harmful to animals that feed on these smaller organisms."

VOA: standard.2010.05.09