stack of the carbonator

例句：

1. 1. They stacked the boxes on top of each other to save space.
   他们把箱子叠在一起以节省空间。
2. 2. The mountain was covered in snow, making it difficult to see the bottom of the stack.
   山被雪覆盖，很难看到堆的底部。
3. 3. The engineer carefully stacked the blocks to build a tower.
   工程师小心地堆放积木来建造一座塔。