We have moved from valves to transistors to minute transistors on microchips, from ferrite core storage to magnetic media to CD-ROMs, from copper wire to optic fibre.

• 我们从电子管依次转向了晶体管和微芯片上的微晶体管，从铁芯储存转向磁介质然后又是可更改指令存储器，从铜线转向光缆。