layer short circuit

例句：

1. 1. The cake is made up of several layers of frosting.
   这个蛋糕由多层霜组成。
2. 2. The book has multiple layers of meanings.
   这本书有多重含义。
3. 3. The engineer used a layer of insulation to improve the building's energy efficiency.
   工程师使用了一层绝热材料来提高建筑的能源效率。