Both slavery and freedom come along at the same time in the Greek world.

奴隶制和自由制,在同一时期的希腊共存

耶鲁公开课 - 古希腊历史简介课程节选

So, the polis will see the invention of freedom in this way, and oddly enough, it is accompanied by the growth of slavery at the same time.

因此城邦见证了自由的兴起,而且很有趣的是,这同时也伴随着奴隶制的不断发展

耶鲁公开课 - 古希腊历史简介课程节选