n. a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth's crust
词态变化
复数形式:oxygens
常见例句
1
A simple or compound principle, whose presence is necessary to produce acidity, as oxygen, chlorine, bromine, iodine, etc.
2
v expose to fresh air v aerate (sewage) so as to favor the growth of organisms that decompose organic matter v impregnate, combine, or supply with oxygen
3
an organism (especially a bacterium) that requires air or free oxygen for life
