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The hole is the opening to what was a dry cave system during the Ice Age.

这个洞是冰河时期一个干岩洞系统的开口。

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The official name of the system is the Mammoth-Flint ridge cave system for the ridge under which the cave has formed.

官方为这个在山脊下形成的山洞命名为猛犸-燧石山脊洞穴系统。

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This vertical cave system has only had three scientific expeditions to it before.

BBC: Grasping the scale of Earth's oceans

The exhibit also includes 3-D scale models of the entire cave system along with a handful of the 2, 000 images that adorn the walls.

WSJ: Prehistoric but Far From Primitive | Cave Paintings of Lascaux | Field Museum | By Mark Yost

That series is always a massive seller for Nintendo, and may cause many on the fence to finally cave and buy the system for themselves.

FORBES: A Year Later, 3DS Sales Make It an Unqualified Success