stacked

例句：

1. 1. The books were stacked neatly on the shelves.
   书被整齐地堆放在书架上。
2. 2. The boxes were stacked in a neat row.
   箱子被整齐地排成一行。
3. 3. The workers were stacking the crates with great care.
   工人们小心翼翼地堆放着纸箱。