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。
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.
音高：在一定音乐声中，某一音调相应的位置，由音高决定。
Music The relative position of a tone within a range of musical sounds, as determined by this quality.
作为固定音高的青铜乐器，编钟的铸制与音律设计、音高调试，成为宋代新乐议制和推行的重要物质基础。
The bronze musical instruments, as the one with fixed pitch, along with its musical temperament design, pitch tuning, it became an important material base to pursue Song new music system.
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