Twitter says its service provides a way for people to stay connected to others, through messages describing what they are doing at that moment.

VOA: special.2009.02.06

So most of the people who are here at the Kennedy School have a commitment to public service,

肯尼迪学院的大部分学生有志于公共服务，

肯尼迪学校 - SpeakingMax英语口语达人

The numbers are from the Economic Research Service at the Department of Agriculture.

VOA: special.2010.12.07

I think it is one of the things that we can be proud of, but my view is that has to be informed consent and I think one of the problems with the way the police service has operated up to now is that the discussion about tactics and strategy has been an internal discussion in the profession and I think the police service needs to be better at having that discussion with the public to whom they are accountable."

VOA: standard.2009.04.21