So the timpani comes in and it goes crazy and comes back to the tonic at which point the trumpet takes over again.

然后定音鼓出现疯狂的转变,回到主音之后,小号再次出现

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Timpani or as it's sometimes called a kettledrum, and it was playing two different pitches, actually sort of playing this pitch and this pitch, the octave and then the fifth.

定音鼓,或者有时称作半球形铜鼓,它正演奏两个不同的音高,实际上在演奏这个音高和另外一个音高,八度音阶和这个五度

耶鲁公开课 - 聆听音乐课程节选

The timpani played that tonic,dominant,tonic,dominant,tonic,dominant.

主音是由定音鼓演奏出来的，属音，主音，属音，主音，属音。

耶鲁公开课 - 聆听音乐课程节选