But the source and dating of the extra material is not known.

On the primary school level, students spend all class time with their peers, but receive extra material to challenge them.

"Potters have to add a lot of extra material to it, I believe."

A special edition implies there is extra material of some kind included.

Each team had its own car with extra material to help with mechanical problems.

If there is more concentration, the extra material must be used up to try to set the change back at equilibrium.

I have come to appreciate over the years, however, that the extra material they provide makes a great safety net.

Well, the extra material isn't on the card, it's embedded in it.

The extra material also features product placement of different Chinese products.

The box set features all of the band's studio albums and extra material from 1983 to 2008.