英语语法分析

The study involved 27,686 patients at the Intermountain Medical Center based in Salt Lake City.

在盐湖城总部的山间医学中心做的这项研究共调查了27，686个病人。

For years, researchers have observed that U. S. suicide rates appear to be highest among residents of the so-called "Intermountain West" region of the country.

多年以来研究人员已经观察到美国的自杀率最高出现了所谓的“居民”而且西部地区。

The researchers evaluated TC levels and survival in 1,646 patients with heart failure selected from the Intermountain Collaborative Study Registry, a ten-year database spanning the years 1993-2003.

从1993年到2003年，研究人员用10年时间，从各个合作研究点筛选了1646名心衰症患者参与试验，测定其受试者TC水平及其存活情况。