健全例如5：“扬基歌”上播放字符串调整同一球场（横向频率），但不同的纵模频率（两个版本在不同的键）。
Sound example 5: "Yankee Doodle" played on strings tuned to the same pitch (transverse frequency) but with different longitudinal mode frequencies (two versions in different keys).
节圆是一个参考圆，花键的键齿的所有的横向尺寸都是以节圆为基础开始计算的。
Pitch circle is the reference circle from which all transverse spline tooth dimensions are constructed.
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