nitrogenKK [ˈnaɪtrədʒən] ｜ /ˈnaɪtrədʒən/
GEPT 中高級
B2noun
A non-metallic chemical element that is normally a colorless, odorless, and tasteless gas. It makes up about 78% of Earth’s atmosphere by volume, and it is a constituent of all living tissues.
Plants require nitrogen as a nutrient, which they obtain either from the soil or from nitrogen-fixing bacteria that live in symbiosis with the plant roots.
氮；氮氣