1. "And when they explained to us how to use the gas mask, I got even more scared. 
   当他们教我们怎么用防毒面具时，我更加害怕了。
2. The part of a gas mask that contains the filter for removing toxic agents from the air. 
   滤毒罐防毒面具的一部分，含有过滤装置，能将有毒成分从空气中除去
3. Which man that the head is normal can not put on the gas mask to go to do that thing? 
   哪个头脑正常的人会不戴防毒面具而去作那件事呢？
4. In one classroom for 9- and 10-year-olds at a Jerusalem school, a boy tried on a gas mask with the help of the soldier instructor. 
   在耶路撒冷一所学校里，一班9至10岁的孩子在学习使用防毒面具。
5. The bomber, the machine-gun, the long-range gun and poison gas are developments of the spear, while the air-raid shelter, the steel helmet, the concrete fortification and the gas mask are developments of the shield.  
   轰炸机、机关枪、远射程炮、毒气，是矛的发展；防空掩蔽部、钢盔、水泥工事、防毒面具，是盾的发展。

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