So little is known about it, because there is only about 1 ATOM OF FRANCIUM IN A CUBIC FOOT OF URANIUM ORE!
对它所知甚少,因为在1立英矿石中,仅有1个钫原子!
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A lump of Plutonium, which is very radioactive, is really quite warm to touch. And francium, which I think is more radioactive, is probably very warm.
块射性很强的钚,起来真的很暖和。我射性更强的钫可能非常暖和。
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