Bhutan's main research center collects a wide variety of data to measure this, including things like psychological well being, good governance, ecological diversity and living standards.

VOA: standard.2009.09.14

And the quarterback who is the main, pretty much the center,

而且四分卫是很主要的，简直就是中锋。

美式足球 - SpeakingMax英语口语达人

Each center is connected to the main hospital by video towers, designed with the help of students at the University of California Berkeley in the United States.

VOA: standard.2010.05.25