To manufacture these integrated circuits, the transistors are built up layer by layer, on a pure crystalline silicon wafer.

为了制造这些集成电路，晶体管需要在纯晶体硅片上一层一层地组装起来。

The transistor used to be a big, bulky device, until the invent of the integrated circuit based on pure crystalline silicon wafers.

过去晶体管是一种又大又笨重的器件，直到基于纯晶硅晶片的集成电路的发明后才慢慢改变。