mound layering

例句：

1. 1.The engineer used a machine to mound the soil and build the foundation.
   工程师使用机器将土壤堆叠起来并建造地基。
2. 2.The layers of the cake were carefully layered to create a smooth texture.
   蛋糕的层次被仔细地堆叠起来，以创造出光滑的质地。
3. 3. The scientist conducted experiments to test the hypothesis that layers of different materials could be used to improve strength.
   科学家进行了实验来测试这个假设，即不同材料的不同层次可以用来提高强度。