nested mold

例句：

1. 1.The bookshelves are nested together to save space.
   书架被层叠在一起以节省空间。
2. 2.The flowers were nested in the garden.
   花园里种着花。
3. 3. The layers of the cake were nested perfectly.
   蛋糕的层次完美地层叠在一起。