stack address control

例句：

1. 1. The boxes are stacked neatly on the shelves.
   箱子整齐地堆放在架子上。
2. 2. The books were stacked in the library.
   书被堆放在图书馆里。
3. 3. The mountain was stacked with snow.
   山被厚厚的雪覆盖着。