When an active tooth in the shark's jaws is lost or worn down, many spare teeth lie in seemingly limitless reserve, each of which are ready to slide into the appropriate position.

当鲨鱼失去或磨损下巴上一颗活跃的牙齿时，许多备用的牙齿似乎就会无限地保留下来，每一颗都随时准备滑入适当的位置。