hello,everyone. today,i am on duty，it's sunny and everyone is here .i want to tell you something about inventions. we study everyday,.when we study at night,we need use light .everybody knows that the light was invented by edison.but do you know when was it invented?it was invented in 1879.edison invented light ,because he worked very hard .although he had failed,but he always work hard,at last,he succeed. we can learn that we should work hard in our life. another invention is computer ,we use it everyday.we use it look for some information, play and so on .it was invented in 1946, which is called eniac. ok.thats all. thanks.

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