He's playing with Freudian slips. Of course, what he's thinking about all the time is the master-slave game, and so here it comes out, when he's talking about his brother's diving: "He's a master diver. You really have to slave away at it."

他在开Freudian滑倒的玩笑，当然，他一直想的是,主人-奴隶的游戏，当谈到他兄弟的潜水时，他提到了：,“他是个跳水能手，你真得埋头苦干拼命练习这个了“

耶鲁公开课 - 1945年后的美国小说课程节选

But one slave-master, a Tuareg chief called Arissal Ag Amdague, said last year that he would free all 7, 000 of the human chattels that he and his clansmen owned.

ECONOMIST: Niger decides not to free its slaves

The two men -- master and slave -- hadn't seen each other in more than a decade.

CNN: Slave master becomes an abolitionist

The slave master-turned-abolitionist made that journey from ignorance to enlightenment.

CNN: Slave master becomes an abolitionist