重 点
Security refers to all the measures that are taken to protect a place, or to ensure that only people with permission enter it or leave it. 保安措施; 安全措施
noun [具体名词] 保护措施，安全工作；保安部门；安检处；保障，保证；安全，安全感；抵押品，保证金；证券，债券
A feeling of security is a feeling of being safe and free from worry. 安全感
- security 出现在下面的课文中（提供视频、音频及笔记等可系统性学习）
- Lesson 9 Royal espionage
