Doctors say that over time the damage interferes with the natural exchange of oxygen and carbon dioxide in the lungs.

VOA: special.2010.06.23

"I usually get together with a daughter and a granddaughter and we go out to dinner and exchange gifts.

VOA: special.2010.02.08

It was not unusual to see him exchange handshakes, smiles and jokes with men who were his political enemies.

VOA: special.2009.01.01

Also,artists and fans can communicate with each other and exchange ideas.

VOA: special.2009.04.08

The rules would require the investment houses to register with the Securities and Exchange Commission if their assets exceed a yet to be determined size.

VOA: standard.2009.03.26

But in an exchange with Senator Russ Feingold, a Wisconsin Democrat, Holbrooke acknowledged the additional troops could drive Taliban and al Qaida fighters further into Pakistan.

VOA: standard.2009.05.12

Senator Roland Burris also blasted the program, and the U.S.government's contract with Boeing for the work, during this exchange with Customs and Border Protection Agency commissioner Alan Bersin.

VOA: standard.2010.04.21