这位主管把整个办公室当成了自己的私人领地，不容他人插手任何事务。

The supervisor treated the entire office as his personal ___fiefdom, allowing no interference in any matters.

这位经理把他的部门当作自己的小王国来管理。

The manager treats his department as his personal ___fiefdom.

这位经理把部门变成了自己的小王国，不容他人插手。

The manager turned the department into his personal ___fiefdom, refusing to let others interfere.