科研之友
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<正>Thomas Alva Edison lit up the world with his invention of the electric light.Without him, the world might still be a dark place.However, the electric light was not his only invention.He also invented the photograph, the motion picture camera, and over1,200 other things.About every two weeks he created something new.托马斯·阿尔瓦·爱迪生以其发明的电灯点亮了世界。如果没有他,世
