fidei defensor

例句：

1. 1. The fidei defensor of the city is responsible formaintaining public order.
   这座城市的守护者负责维护公共秩序。
2. 2. The fidei defensor was appointed to oversee the constructionof the new bridge.
   守护者被任命为监督新桥梁建设的负责人。
3. 3. The fideidefensor was able to prevent theriot from spreading further.
   守护者成功地阻止了骚乱的进一步蔓延。