Lesson 31
Success story
Newton
Bill Gates
Thomas Alva Edison (Feb. 11th, 1847-- Oct.18th, 1931) was an American inventor who invented many importantinventions.   
  Phonograph       留声机   Dictaphone         录音机  Radio              无线电  Electric bulb        电灯泡  Autographic printer  印刷机
(more than one thousand)