But first,we talk to some Americans who have retired from their professional lives but still work hard to help others.

VOA: special.2010.07.16

I don't know how much you've seen, but quite often the way you learned physics earlier on in high school is probably different from the way professional physicists think about it.

我不知道你们对物理有多少了解,但你们以前在高中所学的物理知识,和资深物理学家们的看法,常常是很不一样的

耶鲁公开课 - 基础物理课程节选

Vocational school teachers and administrators from Egypt can also receive professional development through the program.

VOA: special.2009.06.18

Or they buy flowers from a local farmer's market instead of a professional florist.

VOA: special.2010.08.09

The first event included trainers from Washington's professional football,baseball,basketball and hockey teams.

VOA: special.2010.06.07

She sought help from the Maryland State Professional Outplacement Assistance Center,or POAC, which is funded by the state Department of Labor.

VOA: standard.2010.07.28

John Freeman can attest to that. He says he received professional surgery and excellent care from attentive doctors and nurses.

VOA: standard.2010.04.08

The lanky teenager began playing Australian Rules Football just four years ago but has made history by becoming the first player from Africa to join the professional league,the AFL.

VOA: standard.2009.12.17

So far attacks in the U.S. - at least those that are publicly known -- have been thwarted by heightened security awareness and increased counterterrorism measures from the U.S.side, as well as by both bad luck and professional incompetence on the terrorists' part.

VOA: standard.2010.05.05