So little is known about it, because there is only about 1 ATOM OF FRANCIUM IN A CUBIC FOOT OF URANIUM ORE!
对
所
甚少,因为在1立方英
的铀矿石中,仅有1个

!
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That is probably why the United States government has a strategic helium reserve, which I didn't believe either when I first heard it, but we do: 16 billion cubic feet of the stuff trapped in dolomite deposits in Texas.
这可能是为什么美国政府战略性
储存氦的原因,第一次听说时我也不信呢,但事实就是如此:一百六十亿立方英尺的氦储存在德克萨斯州白云石沉积物中。
Originally funded by Texas billionaire Edward P. Bass, its 6,600 panes of glass enclose 7.2 million cubic feet of space, including an artificial rain forest, desert, and tiny ocean, in addition to 3,800 species of animals and plants.
最初由得克萨斯州亿万富翁 Edward P. Bass 资助,其 6,600 块玻璃板包围
720 万立方英尺的空间,包括人工雨林、沙漠和小海洋,此外还有 3,800 种动植物。
球