And one thing I would strongly suggest is to form some sort of study groups, either formally or informally.

我强烈建议大家建立一些学习小组,正式的或非正式的都可以

耶鲁公开课 - 心理学导论课程节选

So I want to be formal about these things i've been mentioning informally.

我想正式地描述一下我之前随口说的事

耶鲁公开课 - 博弈论课程节选

But at some point in the eighteenth century, the mask seemed informally to acquire an alternative title, Comus, and it's as Comus that all readers since have almost always referred to the mask -- and this, of course, is a mistake.

但在18世纪的某个时候，《面具》似乎还有一个不太正式的名，《Comus》,因为《Comus》，后来读者都将它代指《面具》了,当然这是一个错误。

耶鲁公开课 - 弥尔顿课程节选