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| Chinese | English |
| 第一族元素 | element of group Any of the monovalent metals lithium, sodium, potassium, rubidium, caesium, and francium, belonging to group 1A of the periodic table. They are all very reactive and electropositive; alkaline (任何单价金属，如：锂、钠、钾、铷、铯，属于周期表的1A族，反应性高，带正电。) |
| 第一演替阶段 | first stage of succession |