But aerial strikes by U.S.drones against suspected militant targets in the tribal regions have triggered many angry complaints by the Pakistani government, particularly when the attacks result in civilian deaths.

VOA: standard.2009.03.26

They move from regions of high concentration to regions of low concentration by this natural flow down a concentration gradient.

从高浓度区域,向低浓度区域流动,顺浓度梯度流动

耶鲁公开课 - 生物医学工程探索课程节选

There are encoding regions called exons and those are interrupted by non-coding regions called introns.

编码蛋白质的部分叫外显子,外显子被不编码蛋白质的内含子打断

耶鲁公开课 - 生物医学工程探索课程节选

The Institute for Peace study argues that by keeping a tight rein on their people while supporting U.S.security interests in their regions, nations such as Yemen,Egypt, Jordan and Pakistan fan anti-American sentiments.

VOA: standard.2010.05.19

So they kept track of country-by-country, when cases of smallpox occurred, and as it was eliminated from regions of the country, they then certified those regions to be smallpox free.

它跟踪调查了一个又一个国家,记录天花在这个国家中何时发生,又是何时清除的,并确证这个区域已经没有天花

耶鲁公开课 - 生物医学工程探索课程节选

As part of the Department's American Music Abroad Program, the groups will travel to countries not often visited by American jazz musicians, in such regions as Africa,Asia,Europe, Latin America and the Middle East.

VOA: standard.2009.12.25

In some cases that backbone gets methylated and those regions of the DNA that are methylated get treated differently by the cell than unmethylated regions.

一些情况下,主链会甲基化,该甲基化区域的DNA,和未甲基化区域的DNA,会被细胞区别对待

耶鲁公开课 - 生物医学工程探索课程节选