pyramidal layer

例句：

1. 1.The pyramid was built by the ancient Egyptians.
   这座金字塔是古埃及人建造的。
2. 2. The pyramids are a symbol of ancient Egypt.
   金字塔是古埃及的象征。
3. 3.The pyramids were used as tombs for the pharaohs.
   金字塔被用作法老的陵墓。