最初的班卓琴就是有一个葫芦瓢和两根或多根弦拼成，有一根短弦，没有品。

The earliest banjo was a gourd with two or more long strings, a shorter drone string and no frets.

youdao

这就是圆号上的泛音列,活瓣的作用是增长或减短,空气柱的高度,很像大提琴指板上的弦

That's the harmonic series that's on that, and what the valves do is they shorten and lengthen that vibrating column of air very much like the cello string on the fingerboard.

youdao

圆弧可以大量短直线模拟，弦长偏差是圆弧与直线的垂直距离。

Chordal deviation is the perpendicular distance between the actual curve and the approximating line segments.

youdao

That's the harmonic series that's on that, and what the valves do is they shorten and lengthen that vibrating column of air very much like the cello string on the fingerboard.

这就是圆号上的泛音列,活瓣的作用是增长或减短,空气柱的高度,很像大提琴指板上的弦

耶鲁公开课 - 聆听音乐课程节选