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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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cobalt-blue, cobalt-chromate, cobaltco, cobaltglance, cobaltic, cobaltichloride, cobalticyanide, cobaltiferous, cobaltine, cobaltinitrite,

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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.

一块放射性钚，起暖和。我认为放射性更钫可能非常暖和。

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coban, Cobanic, cobasis, cobaya, Cobb, cobber, cobbies, cobbing, cobble, cobble stone,

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3G, 401(K), a,
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