安全，这是一个深入人心、妇孺皆知的话题。小孩子上街，大人嘱咐要注意安全；出差在外，家里人打长途询问是否安全；建筑工地几乎无一例外地挂上“安全第一”的醒目大字标语。就是在我们说话写文章中，也短不了用含有“安全”的成语，如“安居乐业”、“居安思危”、“国泰民 Security, this is a popular topic, women and children are well-known topic. Children go to the streets, adults asked to pay attention to safety; travel outside, the family playing long-distance asking whether it is safe; almost without exception, the construction site to hang “safety first” eye-catching signs. That is, when we speak and write essays, we also have to use idioms that contain “safety,” such as “live and work in peace,” “be vigilant in peace time,” "Cathay people