In moments of war there's great technological innovation, and in the world you have to do without, well, during the Second World War, you had to do without steel, you had to do without aluminum.
En momentos de guerra, hay grandes innovaciones tecnológicas. Al contrario, en el mundo tú tienes que prescindir, bien, durante la Segunda Guerra Mundial, tenías que prescindir del acero, tenías que prescindir del aluminio.