The 2-acre (0.8-hectare) mock moon surface, made of sand and crushed granite, allows engineers to test systems and concepts as they prepare for NASA's return to the moon.

这块用砂石和花岗岩碎块制作的0.8公顷模拟月球表面，让工程师们可以为了美国太空总署(NASA)重返月球的计划而对各种系统和概念进行测试。

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On the Outside: granite crushed stone following the topography – of rough till fine – black aspahlt as a back gear.

在外面，花岗岩碎石填充着这里的地形——从粗糙到精细——黑色的沥青作为备用装置。

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So he blasted out nearly a million and a half cubic yards of granite from the mountainside, then crushed it to make the concrete necessary to build the stadium.

WHITEHOUSE: The Pritzker Architecture Prize