Catherine Hostetler works for the national park service which oversees the Flight 93 Memorial Complex.

凯瑟琳·霍斯泰勒在国家公园管理局工作，负责监管93次航班纪念馆。

In front of me is one of the biggest burls to be recovered by the national park service.

我面前是国家公园管理局要修复的最大树瘤之一。