Every note has a set of frequencies that comprise its harmonic series.

每个音符都有一组频率组成其谐波系列。

Virtually all acoustic instruments produce harmonic series, but each instrument’s shape and material changes the balance of its harmonics.

几乎所有声学乐器都会产生谐波系列，但每种乐器的形状和材料都会改变其谐波的平衡。