stack damper

例句：

1. 1. The boxes are stacked neatly on the shelves.
   盒子整齐地堆放在架子上。
2. 2. The workers stacked the wood to make a fire.
   工人们把木头堆起来生火。
3. 3. The books were stacked in the library.
   书被整齐地堆放在图书馆里。