stack leaning

例句：

1. 1. She stacked the books on the desk.
   她把书堆在桌子上。
2. 2. The boxes were stacked neatly in the warehouse.
   箱子整齐地堆放在仓库里。
3. 3. He stacks his books in a row on the shelf.
   他把书排成一排放在书架上。