"I witness everyday that the creativity and the innovative thoughts that once made the U.S.

VOA: standard.2009.11.25

So once I came to the U.S. I... well,

所以我一到美国，我……嗯，

一见钟情的学校 - SpeakingMax英语口语达人

Republican leaders in the U.S.Congress responded to the president's remarks by charging once again that he wants a health care system run by bureaucrats in Washington.

VOA: standard.2009.06.15

Tranquility is the last major U.S.piece of the space station, and once it is added, the space station will be about Leinbach sent off Endeavour's six-member crew Monday with good wishes for the planned 13-day mission.

VOA: standard.2010.02.08

Sullivan,who once served as secretary of the U.S.Department of Health and Human Services, says minority physicians see a higher percentage of patients with either no insurance, or covered by Medicaid, the government insurance program for low-income Americans.

VOA: standard.2010.03.05