UNIT 4

Transistor

New words and Technical Terms  amplify  emitter  transistor  microprocessor  silicon  Prone to  Vacuum tubes

Text     A transistor is a device that is composed of semiconductor material [1].  [1].晶体管是一个由半导体材料组成器件。  本句是一个系表结构句子，包含有定语从句。  that is composed of semiconductor material用来修饰先行词device，that在从句中充当主语。  And it can amplify a signal or opens or closes a circuit, was invented in 1947 at Bell Labs.