空气消声器

compressed-air brake system for vehicles

spray deflector air-cushion vehicle

hot air sterilizer

air seal【冶】;airtight【航】 机;airtight seal【机】

air brick

air impermeability test【试验】;airtight test【试验】

air-actuated control system【自】;air-operated control system【自】

supply of additional air for additional air(secondary air)