class of explosive-proof

例句：

1. 1.The class of explosive-proof is the most dangerous.
   爆炸物保护类是最危险的。
2. 2. They were assigned to the class of explosive-proof.
   他们被分配到了爆炸物保护类。
3. 3. The class of explosive-proof was responsible for monitoring the area.
   爆炸物保护类负责监控该区域。