1. The carbon content of mild steel is much lower than cast-steel. 
   软钢的含碳量要比铸钢的低得多。
2. A box containing a fire alarm. 
   火警匣装有火警报警器的盒子
3. specially hardened steel plate used to protect fortifications or vehicles from enemy fire. 
   阻止敌人火力进攻、保护军事要塞和武器装备的硬化钢板。
4. The cause of the fire was traced to a faulty fuse-box. 
   起火的原因已查出是因保险丝盒中有短路。
5. He plucked the box out of the fire before the flames caught it. 
   在火焰烧着那个盒子之前，他迅速地把它从火里抱了出来。

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