单词	nitrogen
释义	nitrogennitrogen /ˈnaɪtrədʒən/ ●●○ noun [uncountable] (symbol N) Etymology ETYMOLOGYnitrogen Origin: 1700-1800 French nitrogène, from nitre ( ➔ NITIC ACID) + -gène producing science, chemistry a gas that is an element, has no color or smell, and is the main part of the Earth’s air
随便看	anchorperson anchorwoman anchovy ancient ancient history ancillary -ancy and andante Andersen, Hans Christian Anderson, Sherwood Andes, the andiron Andorra Andorra la Vella Andorran Andretti, Mario Andrew, Saint androgynous androgyny android -andry anecdotal anecdote anemia

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