该计划试图在多孔砂岩中储能，就像美国国土下蕴藏17000亿立方英尺天然气那样。
The plan is to attempt to store energy in porous sandstone, just like the 1.7 trillion cubic feet of natural gas that lie beneath the surface of the United States.
不过艾默灵警告说，如今暴露于空气中的这些多孔砂岩，可能再过几年就会粉碎。
But Emmerling warns that the porous sandstone, now exposed to the air, may crumble within a few years.
由于像如砂岩和砾岩这样的沉积岩是多孔的，它们是地下水的重要潜在来源。
Because they are porous, sedimentary rocks, such as sandstones and conglomerates, are important potential sources of groundwater.
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