看管者

例句：

1. 1. The old man was a keeper of the castle for many years.
   这位老人多年来一直担任城堡的看守。
2. 2. The watchman kept a close eye on the gates.
   守夜人严密地监视着大门。
3. 3. The guardians ensured that all inmates were properly cared for.
   监护人确保所有囚犯都得到适当的照顾。