Anglers are required to obtain prior authorization from the park keeper.
垂钓者必须事先得到公园管理者的许可。
英语百科
Prior authorization
Prior authorization is a process used by some health insurance companies in the United States to determine if they will cover a prescribed procedure, service, or medication. The process is intended to act as a safety and cost-saving measure, although it has received criticism from physicians for being costly and time-consuming.