The front end of the GMU overhung the rim, elevated now by the hundreds of orbs that had streamed from the cave after the chute had been opened.

GMU的前端悬在竖槽边，几百个圆球正在下面抬升。它们都是自竖槽打开后从洞里涌出的。

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It combines the independence from University sponsorship of the Udacitys of the world with the academic street cred of, say, CourseRA. Marginal Revolution University (or MRU for short) has been developed by two GMU economic professors, Tyler Cowen and Alex Tabarrok.

FORBES: Online Education Experiments at the Margin