So I need to find out the heats of formation of the iron oxide and the water.

所以我需要找出氧化铁和,水的生成热，如果我这么做了。

麻省理工公开课 - 热力学与动力学课程节选

Seems very simple, but took Beethoven a long time to iron all this out and make this perfect melody, the prototypical melody in a way.

似乎很简单,但是花了贝多芬很长时间来琢磨,最后做出这段完美的旋律,这段典范旋律

耶鲁公开课 - 聆听音乐课程节选