de haut en bas

例句：

1. 1. I need to findthe book that is on the top shelf, and then move it down to thebottom shelf.
   我需要找到放在最顶层架子上的书，然后把它移到底层架子上。
2. 2. The students are divided into two groups, with one group sitting on the topfloor and the other on the bottom floor.
   学生们被分成两个小组，一个小组坐在顶层，另一个小组坐在底层。
3. 3. The teacher askedus to stand up and move aroundthe classroom, de haut enbas.
   老师让我们站起来在教室里走动，上到下，下到上。