What is it that makes you slave away in spite of your repugnance, which is both obvious and understandable?

你为什么要费力为嫌恶的人而辛劳呢-而这种嫌恶是显然和可以理解的？

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If a slave dies you got to buy a new machine, and while he's alive you got to feed him.

如果一个奴隶死掉了,你就得买台新的,他活着时你还要养着他

耶鲁公开课 - 古希腊历史简介课程节选

Only in the Roman Empire could slavery actually start being a way that you can move up in society, because you could-- if you were a talented slave, your owner might free you, probably would free you.

只有在罗马帝国，奴隶制可以成为,提高社会地位的手段，因为。。。,如果是一个能干的奴隶，主人可能会释放他，很有可能。

耶鲁公开课 - 新约课程节选

So, you have to feed the slave all year round to work only a small part of the time, that's not very profitable.

你不得不整年的喂养奴隶,而他们只有少量时间在工作,这是很不划算的

耶鲁公开课 - 古希腊历史简介课程节选

No-one has the right to treat you as his or her slave.

BBC: Last Updated: Thursday December 08 2005 15:10 GMT

No one gets rich as a salary slave, but if you lack the entrepreneurial spirit and want to make a comfortable living, put away that salad tosser and start getting cozy with a stethoscope.

FORBES: Magazine Article

Third, I would like to know your source regarding the African Slave Traders, and also you missed the Portuguese.

FORBES: The free flow of talent