留言板

例句：

1. 1.The school has a bulletin board on the wall for students to leave messages.
   学校在墙上有一个公告栏供学生留言。
2. 2. She posted her message on the bulletin board.
   她在公告板上留下了她的信息。
3. 3. I've been using this bulletin board for years, and it's still working perfectly.
   我用了多年的公告板，它仍然完美无缺。