Communication:Technology Starters——Water Power

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Communication:Technology Starters——Water Power

In the ancient time, nearly every work must be done by hands. This is very laborious. It not only takes a lot of time, but also is tiring. So people have always been thinking of inventing machines to work for them. Machines saves people a lot of trouble. They can do a lot of work both quickly and easily. But machines need energy or it can not work. There is one inexhaustible natural energy, that is the water power.

  • Added:2006
  • Country:France
  • Duration:15
  • Time of update:2011/3/11 15:03:55

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