We've changed the external pressure slowly, and again this is isothermal.

我们慢慢改变外部压强，这个过程也是绝热的。

麻省理工公开课 - 热力学与动力学课程节选

In fact in spite of the way we tell our story we actually changed the assignment.

尽管实验的过程是这样,可我们实际做了些改变。

麻省理工公开课 - 媒体、教育、市场课程节选