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So little is known about it, because there is only about 1 ATOM OF FRANCIUM IN A CUBIC FOOT OF URANIUM ORE!

对所知甚少,因为在1立方英的铀矿石中,仅有1个钫原!

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3G, 401(K), a,

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趣味化学实验：Periodic Videos

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.

射性很强的钚，起来真的很暖。为射性更强的钫可能非常暖。

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deep-seated, deep-set, deep-tillage, deep-voiced, deepwater, deepwaterman, deer, Deer Hunter, deerberry, Deere,

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3G, 401(K), a,
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