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。