学习如何在英语句子中使用 francium。超过 4 条精选例句，附带译文。适配手机，完全免费。由 Mate 提供支持。
Lithium, sodium, potassium, rubidium, caesium and francium are alkali metals.
At any given moment, there are perhaps eight francium atoms in the whole of the earth.
Francium is a chemical element of the symbol Fr.
The atomic number for francium is 87.
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