1. a shield of lead or concrete intended as a barrier to radiation emitted in nuclear decay. 
   一种防止核衰变发出的射线的铅或混凝土防护罩。
2. The bomber, the machine-gun, the long-range gun and poison gas are developments of the spear, while the air-raid shelter, the steel helmet, the concrete fortification and the gas mask are developments of the shield.  
   轰炸机、机关枪、远射程炮、毒气，是矛的发展；防空掩蔽部、钢盔、水泥工事、防毒面具，是盾的发展。
3. God is our shield. 
   神是我们的保护者。
4. concrete character of truth 
   真理的具体性
5. concrete for hydraulic structure 
   水工混凝土

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• 1. 盾构混凝土
  shield 遮蔽板...shield concrete 盾构混凝土...shim 衬垫
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