fortified border的用法和樣例：
例句
- The victors seized the fortified cities of Egypt and plundered the land.
于是埃及國設防的各城全都陷落了，財產被搶掠一空。 - And last September government unveiled a high-tech, gun-toting sentry robot that could support troops along the heavily fortified border with North Korea.
去年九月，韓國政府推出了一款持槍的高科技哨兵機器人，這種機器人可為重兵設防的韓朝邊界提供兵力支持。
