我们经常听到一些17、18世纪的瓜尔内利（Guarnet）或斯特拉迪瓦利（Stradivari）小提琴售价达几十万至百万美元。然而没有听说一把古老的吉他有类似的情况。其中一个原因是在本世纪吉他的设计和构造发生了戏剧性的变化，大量优秀的吉他被制作出来了；另一个原因是在自然状况下 We often hear some 17th and 18th centuries Guarnet or Stradivari violin cost hundreds of thousands to millions of dollars. However, I did not hear a similar situation with an old guitar. One of the reasons is that dramatic changes have taken place in the design and construction of guitars this century, and a great number of excellent guitars have been made; another reason is that under natural conditions