stacked heads

例句：

1. 1.The books were stacked neatly on the shelves.
   书整齐地堆放在书架上。
2. 2.The boxes were stacked in a neat row.
   箱子整齐地排成一排。
3. 3.The food was stacked high in the refrigerator.
   食物被堆得高高的，放在冰箱里。