They farm tilapia - mostly in China. Sporns says the U.S.has an international certification process that is rigorous and will catch potential problems.

VOA: standard.2010.05.27

Any potential problems with that approach?

但是这种方法是否有潜在问题

耶鲁公开课 - 生物医学工程探索课程节选

"We have not shied away from raising the difficult problems that exist and stand in the way of the people of Africa realizing their potential.

VOA: standard.2009.08.16