custodial model

例句：

1. 1. The custodian of the museum was responsiblefor maintaining its safety and security.
   博物馆的看护员负责维护其安全和安保。
2. 2. The custodian ofthe library was in charge of organizing thebookshelf.
   图书馆的管理员负责组织书架。
3. 3. The custodian ofthe school playground was responsible for ensuring itwas safe for students to play.
   学校操场的看护员负责确保学生可以安全玩耍。