A colorless, odorless, tasteless, gaseous mixture, mainly nitrogen(approximately78percent)and oxygen(approximately21percent)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