In July,President Barak Obama and his Russian counterpart Dmitry Medvedev agreed to reduce their respective numbers of nuclear warheads to between 1,500 and 1,675 under a new treaty.

VOA: standard.2010.02.03

From Barak Obama.com, a moral imperative by any measure, by any measure, mark that, Dr. Sowell, a better health care system is also essential to rebuilding our economy.

援引，Barak，Obama。com网站的话，道德上,不管怎样，不管怎样，索尔博士，听听他说的，一个更好的医疗体系,对于重建经济很重要。

斯坦福公开课 - 经济学课程节选

In an off-year election seen by some political pundits as a measure of support for President Barak Obama's popularity after his first year in office, the opposition Republicans have picked up the state house in two formerly Democratic states.

VOA: standard.2009.11.03