详细解释:全国科学院(美国)
【计】 网络应用支持
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, Na, atomic number 11