a silvery soft waxy metallic element of the alkali metal group; occurs abundantly in natural compounds (especially in salt water); burns with a yellow flame and reacts violently in water; occurs in sea water and in the mineral halite (rock salt)
sodium的用法和樣例：
例句
用作名詞 (n.)
Common salt is a compound of sodium and chlorine. 食鹽是鈉和氯的化合物。
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