层叠

例句：

1. 3. 例句：1. The books are layered with different themes.
   这些书覆盖着不同的主题。
2. 2. The layers of the cake are rich and delicious.
   这蛋糕的层次丰富又美味。
3. 3. The layers of the city are changing rapidly.
   这个城市的层次正在迅速变化。