Blacks were not permitted to play on professional baseball teams or in any other major league sport.

VOA: special.2009.04.05

On other, on other grounds You, a professional economist, do not bring your expertise to bear on this man in evaluating him?

那是站在其他的角度,你可是一名专业的经济学家呢，难道你不,利用自己专业的评价来给他加点分吗？

斯坦福公开课 - 经济学课程节选

Robinson's success opened the door for other black athletes to play on all-white professional teams.

VOA: special.2009.04.05

In nineteen fifty, she and twelve other women founded the Ladies Professional Golf Association.

VOA: special.2009.03.29

He says these people would like to go to other countries to continue their studies and upgrade their professional skills.

VOA: standard.2010.06.01