a light soft silver-white metallic element of the alkali metal group; oxidizes rapidly in air and reacts violently with water; is abundant in nature in combined forms occurring in sea water and in carnallite and kainite and sylvite
例句
用作名词(n.)
The components of a potassium cycle vary greatly.钾素循环的各个环节有很大的变化。
What fruit vegetable contains potassium most?什么水果蔬菜含钾最多?