letterboxing

BOB DOUGHTY: In nineteen ninety-eight, a magazine story in the United States introduced letterboxing to many Americans.

鲍勃：在十九九十八个，一个在美国的杂志故事介绍letterboxing许多美国人。

She says letterboxing encourages generations to work together while enjoying the outdoors and exploring new places.

她说，letterboxing鼓励几代人的共同努力，同时享受户外活动，并探索新的地方。