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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!

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centre, centre of curvature, centre of gravity, centre of mass, centrebit, centre-bit, centreboard, centrebody, centre-crank, centrecut,

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3G, 401(K), a,

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原声例句
趣味化：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.

一块性很强的钚，起来真的很暖和。我认性更强的钫可能非常暖和。

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centrifugationr, centrifuge, centrifuger, centrifuging, centrilobular, centrine, centring, Centrino, centriole, centripetal,

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3G, 401(K), a,
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