fortify

• The medieval town is fortified with a high wall and a deep moat
  这座中世纪的城市用高墙深沟来加强防御。
• This bunker is highly fortified ,
  这个碉堡的戒备十分森严
• The medieval town was fortified with a high wall and a deep moat
  这座中世纪的城市用高墙深沟来加强防御。
• The medieval town was fortified with a high wall and a deep moat
  这座中世纪的城市周围建有城墙和护城河。
• The medieval town was fortified with a high wall and a deep moat
  这座中世纪的城市周围建有城墙和护城河。