This is the 11059th most frequent Spanish word.
duradero
Long-lasting or durable.
In this sentence, 'duradero' is used as an adjective describing the quality of the design of the bridge, emphasizing its ability to last long.
Este puente fue construido con un diseño muy duradero.
This bridge was built with a very durable design.
Here, 'duradera' is used as an adjective describing a desired quality of the friendship, implying its intended permanence.
Espero que nuestra amistad sea duradera.
I hope our friendship is lasting.
In this example, 'duraderas' is an adjective applied to strategies, indicating that these strategies should have the capacity to endure challenges over time.