Dewaal says, there is evidence some imported shrimp are grown in contaminated ponds.

VOA: standard.2010.05.27

He's interested in sailing and learns about sailing on lakes, and ponds, and rivers.

他喜欢航海,并在湖泊,池塘,河流里学习航行

耶鲁公开课 - 欧洲文明课程节选