protective gas保护气体protectiveadj.保护的；防卫的Protective parts and fittings LT保护器件及配件protective installation of works工事防护设施Protective Pouch with Neck Strap带脖套的保护袋Protective clothing must be worn请务必穿防护服protective preparation for metal金属保护制剂Protective ventilation strategies呼吸窘迫综合征protective legislation/tariffs贸易保护法令/关税protective development of tourism保护性旅游开发protective connecting arrangement保护连接编排protective measures and proposals保护方法和建议