In this case, the basic column of air is twelve and a half feet long and there are something called "Partials" or the "Harmonic series" That happens in anything, on a string instrument or whatever, but on the horn it's very distinct and that's what makes the different notes.

像这样,基本空气柱有十二个,每个半英尺长,圆号能发出分音,或泛音列,弦乐器或是,其他别的乐器中都有,但在圆号上,效果相当不同,这就是它能奏出不同音符的原因

耶鲁公开课 - 聆听音乐课程节选

National Hurricane Center data show a dramatic decline in major hurricanes striking the United States during the past half century (see my recent column on this here).

FORBES: Move up http://i.forbesimg.com t Move down

Abelson began writing Up and Down Wall Street in 1966 and the column became a weekly mainstay of the publication for nearly half a century.

WSJ: Longtime Barron's writer Alan Abelson dies at 87