By the 1830s,1840s, there were over 100 men in Charleston, South Carolina alone, making their livings full-time as slave traders.

到了十九世纪三四十年代,仅仅在南卡罗来纳的查尔斯顿地区,就有超过一百个,专职从事奴隶贸易的奴隶交易商

耶鲁公开课 - 美国内战与重建课程节选

It had two--depending on when you look to three dozen major full-time slave traders.

有二十或三十多个,专业的奴隶贩子

耶鲁公开课 - 美国内战与重建课程节选