President Obama got a rousing welcome warned as he strode into a large hall for the opening ceremony of the fifth Summit of the Americas.

VOA: standard.2009.04.17

A studio of three hours' lecture in a large lecture hall, and two hours of recitation in groups of thirty.

在一个大的讲堂的教室里,讲三个小时讲座，并以三十人为一组,进行两小时背诵。

麻省理工公开课 - 媒体、教育、市场课程节选