A colorless,odorless,tasteless,gaseous mixture,mainly nitrogen(approximately78 percent) and oxygen(approximately21 percent) with lesser amounts of argon,carbon dioxide,hydrogen,neon,helium,and other gases.

• 空气，一种无色、无嗅、无味的气体混合物，主要由氮气（约占78%25）和氧气（约占21%25）组成，还有少量的氩、二氧化碳、氢、氖、氦及其它气体。