Say that the material is all that is around us. Engineers who need to have knowledge about the internal structure and properties of materials are used to select the best fit.
To say that the material is everything around us that engineers need to have knowledge of the internal structure and the properties of the selected material is used, appropriate.
He said that the material are the things that have been around in the US, an engineer will need to have the knowledge of the structure and properties of materials within a reasonable option, and use it as well.