1. The police are responsible for the preservation of law and order. 
   警察有责任维持法律和秩序。
2. The police is responsible for the preservation of law and order 
   警察负责维持治安
3. The police are responsible for the preservation of public order and security. 
   警察有责任维护公共秩序和安全。
4. The Provisional Urban Council is committed to improving the urban environment with landscape and tree preservation. 
   临时市政局致力美化环境及保护林木，以求改善都市环境。
5. The building cannot be made any structural alterations to because it was built in the sixteenth century and a preservation order has been clapped on it. 
   该建筑建于16世纪而且对它有一个保护法令，所以我们不能对其结构作任何更改。

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