Communication-通讯,Communication-通讯范文

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munication-通讯英语作文网为您收集 作文网 When men began to like together in small munities, they it was necessary to find ways of sending messages from one munity to another. Even in earliest times there were several different ways this could be done. Really rapid munication was not possible until electricity was put to work. In 1844 the first electric telegraph was constructed. Thirty years later the telephone was invented. Soon a whole suession of inventions was produced: the wireless telegraph and the radio, the motion picture, and television. Earth satellites today bring valuable information almost instantaneously to our homes by means of electrical signals.

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