bullet-proof
  防彈的
  bul·let-proof, bul·let·proof a.
  1. Capable of resisting the force of a bullet; resistant to penetration by a bullet; armored; as, a bulletproof vest; a bulletproof window.
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  bulletproof
       adj 1: without flaws or loopholes; "an ironclad contract"; "a
              watertight alibi"; "a bulletproof argument" [syn: ironclad,
               unassailable, unshakable, watertight]
       2: not penetrable by bullets; "bulletproof glass"; "bulletproof
          vest"