Bridges are like giant sandwiches. They have strong materials inside, like steel or concrete, that hold them up. Over time, they might get a little tired, but engineers help them stay strong by fixing the parts that wear out.
Examples
- A wooden bridge might get a new plank when one breaks.
- Engineers paint a steel bridge to stop it from rusting.
- Older bridges sometimes have extra supports added.
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Categories: Science · Engineering,Materials Science,Structures