In other, perhaps more spiritual, times, harmony and proportion have been valued more highly than costly materials.

Currently, carbon-fiber composite fabrication requires much hand work with costly materials.

The nation could also improve fuel economy without sacrificing car size if auto makers used lighter - but costlier - materials.

Alternatives include a permanent abandonment of glass recycling, which has proven to be the most difficult and costly material to reprocess.

Most damage was done not to the ships, but to costly material on the ground.

The cedar siding was one of the costliest materials he used.

Unable to publish this costly but unremunerative material, he was delighted to give it up to the Ray Society.

Scientists claim that antimatter is the costliest material to make.

Her mechanical knowledge was very meager, but she could at least declare that Felber used costly materials.

Auto makers hope to meet the tough rules by using more lightweight but costly materials like aluminum, and by building smaller cars.