"Hello and welcome back to another half-hour segment of Cloverdale's Corner. Today is Tuesday, and Lourdes has had to leave but we still have four people here ..."

VOA: special.2011.07.21

Take four liters on this corner of the room.

在这房间的角落里取四升空气。

麻省理工公开课 - 热力学与动力学课程节选