单词	o--oxygen
释义	oxygen，O氧
随便看	air-tight instrument air tight joint air-tight joint air tight locker airtightly air-tight machine air tightness air-tightness airtightness air tightness [= gas tightness] air tightness test airtightness test air tight ring air tight seal air-tight seal air-tight separator air-tight seperator air tight silo air-tight silo airtight silo air-tight stove air tight test air-tight test airtight test air tight test; airtight test