弦做为振动的发源体,很早就运用于乐器了,如古代的琴、瑟、琉特、里拉及今天的琵琶、三弦、二胡、京胡、钢琴、提琴、吉它、曼多林等。什么是弦?弦是指用一定张力拉紧的固体物质的线,乐器上用的柔顺的丝线、尼龙线、肠衣线及金属线等,通常就称做弦。这样的弦,只要变更其张力或长度,就能很容易地改变固有振动频率,因此,用于乐器在演奏时是很方便的。 As a source of vibration, strings have long been used in musical instruments such as ancient pianos, sesals, tiotes, liras, and today’s pipa, sanxian, erhu, Jinghu, piano, violin, guitar, and Mandolin. What is a chord? Chord refers to a certain tension tension of the solid material lines, instruments used on the smooth silk, nylon, casing and wire, usually called chord. Such a chord can easily change its natural frequency by changing its tension or length, so it is convenient for the instrument to be played.