要是我的幻灯片能用的话，我要用幻灯片为你们演示，这些有泛音列的乐器。
I'm going to show you, if we can get our slides up, this overtone series stuff.
音乐的第二种起源是泛音列，它由无音孔开管形成。
The second origin of music comes from the harmonic series, which is demonstrated by the open pipes without holes.
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.
伊娃今早在吉尔·福特还有其他表演，所以她得告辞了，现在，要是我的幻灯片能用的话，我要用幻灯片为你们演示，这些有泛音列的乐器。
Okay. Now Eva has another gig out in Gilford this morning so she's going to run off, and I'm going to show you, maybe, if we can get our slides up, this overtone series stuff.
伊娃今早在吉尔·福特还有其他表演，所以她得告辞了，现在，要是我的幻灯片能用的话，我要用幻灯片为你们演示，这些有泛音列的乐器。
Okay. Now Eva has another gig out in Gilford this morning so she's going to run off, and I'm going to show you, maybe, if we can get our slides up, this overtone series stuff.
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