详细解释:北美洲, 国立研究院院士, 国立研究院, 国民军
【医】 钠(11号元素)
英语解释：
名词 na:
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)同义词：sodium, atomic number 11