虽然华盛顿和杰斐逊私下里表达了对奴隶制的厌恶，但他们也明白，奴隶制是他们帮助建立的这个国家的政治和经济基础的一部分。

While Washington and Jefferson privately expressed distaste for slavery, they also understood that it was part of the political and economic bedrock of the country they helped to create.

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本周早些时候，包括美国铝业、卡特彼勒公司和杜邦公司等10家企业联合要求国会尽快建立温室气体配额交易制。

Earlier this week ten companies, including Alcoa, Caterpillar and DuPont, called for Congress to set up a cap-and-trade system for greenhouse gases as quickly as possible.

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布什允许各州根据自己认为合适的情况支配这笔基金- - -前提是他们必须建立教师责任制制度。

Bush would allow states to spend the funds as they see fit — so long as they establish teacher-accountability systems.

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Harvard has residential colleges of the kind and Princeton only had it in the last twenty years.

哈佛大学有住宿学院,普林斯顿是在最近二十年来才建立住宿制的。

普林斯顿公开课 - 人性课程节选