Del cemento al puente (From Cement to Bridge)
How is a bridge built? Cement is mixed with water and rocks to make concrete. The concrete is poured into holes and into blocks that are stacked to make a bridge. Once fences and lights are added to the bridge, cars can drive across it.
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Los obreros preparan el terreno
Se construyen los encofrados
Se construyen los extremos
Se construyen las patas
Una Máquina coloca las vigas