黑板架

例句：

1. 1. The teacher needs to adjust the height of the blackboard so that it is level with the students' desks.
   老师需要调整黑板的高度，使其与学生的课桌水平。
2. 2. The student asked for a new blackboard, but the school didn't have one available yet.
   学生要求更换新的黑板，但学校还没有可用的。
3. 3. The teacher demonstrated how to fix the blackboard and how to clean it properly.
   老师演示了如何固定黑板以及如何正确清洁它。