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safety
指避免危险、意外或伤害的状态，常用于物理、健康相关的场景。
security
强调防止犯罪、攻击、盗窃等威胁，更多用于人身、国家或网络等防护方面。
| Word | 关注重点 | 使用场景 | 常见搭配 | 词性 |
|---|---|---|---|---|
| safety | 防止事故或伤害 | 交通、生产、学校等日常生活 | safety rules, safety belt, fire safety | 名词 |
| security | 防止犯罪或威胁 | 机场、国家、数据系统等防护环境 | security guard, national security, cybersecurity | 名词 |
❌ The company hired a safety to protect the building.
✅ The company hired a security guard to protect the building.
❌ I feel safety when I lock the door.
✅ I feel secure when I lock the door.