Francium is the densest of the Alkali Metals and also radioactive.
钫是碱金属,有放射性。
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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.
一块放射性很，很暖和。我认为放射性更钫可能非常暖和。
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划词翻译
详细解释
,
有放射性。
，
