Well if you have a slave, that slave can't actually sign contracts.

如果你有一个奴隶，但法律规定奴隶不能签署合同。

耶鲁公开课 - 新约课程节选

Soil was being eroded and wasted along the Eastern seaboard, and they were using up the great soils of the Mississippi Valley and over time that slave system just somehow wasn't going to work out.

东部沿海地区的土地因被侵蚀而荒废掉,密西西比河谷地区的土地资源即将被耗尽,但就在这种情况下,奴隶制依然能维持南方的经济

耶鲁公开课 - 美国内战与重建课程节选

If you think about it, it means that I'm a slave, that I don't own myself.

仔细想想，这就意味着我是一个奴隶，我不是自己的主人。

耶鲁公开课 - 公正课程节选

"It's silly because I don't want to be a slave to marketing but it really got into my head, " said Ms. Daniels, who recently switched to the Samsung phone from an older iPhone.

WSJ: Has Apple Lost Its Cool to Samsung?

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

CNN: Slave master becomes an abolitionist

He says Kashkari worked like a slave, often even on projects he wasn't directly overseeing.

NPR: Ex-Rocket Scientist To Oversee Financial Bailout