upper berth ladder

例句：

1. 1. The upper berth ladder is a must-have for students who like to study in the dormitory.
   上铺梯是学生宿舍里喜欢学习的人的必备品。
2. 2.The upper berth ladder is used to climb up to the upper bunk bed.
   上铺梯用来爬上上铺床。
3. 3.The upper berth ladder is a great way to store and organize books on the upper bunk bed.
   上铺梯是一个很好的方法来在上铺床上储存和组织书籍。