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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!

对它所少,因为在1立方英的铀矿石中,仅有1子!

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原声例句
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.

一性很强的钚，起来真的很。认为性更强的钫可能非常。

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