这位历史学家研究了18世纪奴隶贩子的贸易路线。

The historian studied the trade routes used by ___slave-traders in the 18th century.

这家服装公司的老板被媒体称为当代奴隶贩子，因为他压榨工人工资。

The media called the clothing company boss a modern-day ___slave-trader for exploiting workers' wages.