Such as at the beginning periods of several-department music, people always adopt to the the most simple frequency or the purest perfcet fourth and fifth interval.
如在多声部音乐萌芽时期除了应用八度音程以外，人们只采用频率比数最简单的，即音响最协和的纯五度与纯四度音程；
The next pitch on the trumpet is actually an interval of a fifth.
小号的下一个音高实际上是一个五度音程。
Then the next pitch on the trumpet is actually an interval of a fifth.
然后下一个音高在小号那里，实际上是一个五度音程。
Then the next pitch on the trumpet is actually an interval of a fifth.
然后下一个音高在小号那里，实际上是一个五度音程。
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