磁性水雷

例句：

1. 1. The magnetic mine was a major source of security for the city.
   这个磁性水雷是城市安全的主要来源。
2. 2. The military used magnetic mines to protect their borders.
   军队使用磁性水雷来保护他们的边境。
3. 3. The magnetic minelaying device is a complex system that can be used to detect and neutralize enemy forces.
   磁性水雷装置是一个复杂的系统，可以用来检测和中和敌方力量。