求翻译：　　FPGA是细粒结构，这意味著每个单元间存在细粒延迟。如果将少量的逻辑紧密排列在一起，FPGA的速度相当快。然而，随著设计密度的增加，信号不得不通过许多开关，路由延迟也快速增加，从而削弱了整体性能。CPLD的粗粒结构却能很好地适应这一设计布局的改变。 ,'是什么意思？

The fpga is a fine-grained structure, which means that there is a fine delay between each unit. If a small amount of logic are closely packed together, fpga very fast. However, with the design density increases, the signals have to go through a lot of switching, routing delay, a rapid increase, thus