历史书上记载，奴隶贩子们经常用船只将非洲人运往美洲。

History books record how ___slave-traders often transported Africans to America by ship.

抗议者称那些压榨外卖骑手的平台就是当代的奴隶贩子。

Protesters called food delivery platforms modern ___slave-traders for exploiting riders' labor.