Bridge

A bridge is a structure built to span a valley, road, body of water, or other physical obstacle, for the purpose of providing passage over the obstacle. Designs of bridges vary depending on the function of the bridge and the nature of the terrain where the bridge is constructed. But since the world has been making new types of bridges, more have been proven to be safer and to be more logical to use. There are even retracting bridges that are used for curfews.
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