That is the fundamental idea that may seem simple and obvious to you, but it certainly wasn't back when the idea first came up.

刚才讲的就是最基本的概念,可能看起来比较简单明显,但这些概念刚出现时并不被广泛理解

耶鲁公开课 - 金融市场课程节选

Consent is an obvious familiar idea in moral and political philosophy.

同意这个概念在道德和政治哲学中很常见。

耶鲁公开课 - 公正课程节选