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

It has to on the one hand be annoying enough to actually generate help, to get people to help you, to feed you, to pick you up, to take you and put them next to you.

一方面，得足够吵闹,他人才能帮助你，让人们帮助你，喂养你，收养你，带上你，让他们接近你。

耶鲁公开课 - 心理学导论课程节选