nested macros

例句：

1. 1.The tree is nestled in a secluded valley.
   这棵树坐落在一个偏僻的山谷里。
2. 2. The layers of the cake are rich and creamy.
   蛋糕的层次丰富而细腻。
3. 3.The story is nested within the larger narrative.
   这个故事被更大的叙述所包含。