ranger [ˈreɪndʒə(r)]

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n.国家公园管理员，护林员；骑兵巡逻队员

a person whose job is to protect a forest or natural park

He was the head ranger of the national park. 他曾是国家公园的首席看守员。
He loved working as a ranger. 他喜欢做护林人。