The main reason for this was that although moveable type can be used repeatedly, every time you reuse a character it has to be remounted. Books were not distributed on the large scale of today but usually only printed in small numbers and reprinted if there was a market.
主要原因在於：活字固然可以反覆使用，但每次重印都需重排，古代圖書不像現在大規模行銷，通常都是只印一點，有市場再印。