Posters, bulletin boards, or any other thing hanging on the wall is considered property of the school and shouldn't be written on or removed without permission.

海报、公告栏或是其他任何悬挂在墙上的东西都是学校的财产，未经许可是不可以涂写或者拆除的。

youdao

When painting in school, I always like to go to school to see where the notice of electronic bulletin boards to learn the latest school activities.

在学画画的时候，我总喜欢去学校电子宣传栏那里看通知，了解学校活动的最新动态。

youdao

Place your goal times everywhere you can think of: school and pool lockers, mirrors, nightstand, homemade book covers and bulletin boards.

把你的目标成绩张贴在你所能想象的任何地方：学校、泳池的更衣柜、镜子、床头柜、家庭作业本的封面上甚至于公告板上。

youdao

Time after time, parents step up to make cookies for the bake sale, coach sports programs after school, weed and maintain the school grounds, put up bulletin boards, work the book fair and more.

FORBES: Back to School: Volunteering Your Services

Here at Bethune they've been fixing up bulletin boards and organizing school supplies all month.

NPR: A New School Year Begins in New Orleans