带正电荷的粒子集中在云团的顶部和底部，但中间区域形成的是带负电荷的粒子。

Concentrations of positively charged particles develop at the top and bottom of the cloud, but the middle region becomes negatively charged.

youdao

很大程度上，由于这个原因，欧洲的政治权力几个世纪以来都集中在南部，围绕着地中海区域，在那里他们可以更放心地种植这些谷物。

And largely for this reason that political power in Europe was centered for centuries in the South, around the Mediterranean Sea, which was where they could grow these grains with more reliability.

youdao

识别这些区域有利于将代码检查的力量集中在关键区域，从而提高效率。

Identifying such areas allows code review efforts to be focused on such critical regions, raising efficiency.

youdao

That means that you can go through twenty years of a career on Wall Street and all you've observed is observations in the central region.

这就是说,你在华尔街混了二十年,所有观察值都集中在中心区域

耶鲁公开课 - 金融市场课程节选

So, there's a whole lot of sensory organs, for instance, focused along your tongue, and that's why that's so big, and an enormous amount on your face but your shoulder isn't even— doesn't even make it on there because although your shoulder might be bigger than your tongue, there's not much going on.

比如,在你的舌头上,集中存在着非常多的感觉器官,也就是这片区域如此之大的原因,你的脸上也有数量庞大的感觉器官,但你的肩膀并没有,你的肩膀甚至都没有在示意图中标示出来,因为,尽管你的肩膀要比你的舌头更大,但却并没有什么感受器官

耶鲁公开课 - 心理学导论课程节选

This is introducing a gene, it's a natural gene but it's not - it's a natural gene that's found in humans and is actually expressed all over your body in different levels, but you're concentrating it or over expressing it in one particular region of tissue in order to have a particular effect.

通过导入一个基因,这是一个天然基因但--,是一种于人体内发现的天然基因,在全身细胞中都有不同程度表达,但需要集中在组织的某一特定区域,表达或过表达,才能达到特定疗效

耶鲁公开课 - 生物医学工程探索课程节选