Some materials are available free at Web sites like the Purdue Online Writing Lab,or OWL.

VOA: special.2010.02.11

So as some of you probably know, Yale is undergoing an open education project and they're videoing several classes, and the idea of this, is to make educational materials available beyond the walls of Yale.

可能你们已经知道了,耶鲁大学正在开展一个教育项目,我们在录制一些课程的录像,这样做的目的是让,耶鲁外的人也能享受到这些教学资源

耶鲁公开课 - 博弈论课程节选

Root beer can be made with the materials that are readily available in America.

VOA: special.2011.08.01

Gone Rural also has some products available in other materials.

VOA: special.2009.05.04