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	fleet fleet admiral fleeting fleetingly Fleming, Alexander Fleming, Peggy Flemish flesh flesh-colored fleshly fleshpots flesh wound fleshy flew flex flexibility flexible flexibly flextime flick flicker flier flies flight flight attendant

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