bombproof [ˈbɑ:mpru:f]

例句:

• Used to indicate that something is exceptionally solid, e . g . an anchor, a hold . See also bombproof.
  常用来表示一个固定点或把手点非常坚固.
  
• He explained that despite looking "bombproof", they were sensitive creatures with wonderful characters.
  来自BBC
• They explored a network of bombproof tunnels, built by a German company in the eighties and nineties.
  来自NEWYORKER