tetrahedral sheet

例句：

1. 1. The architect designed the building with a tetrahedral shape.
   建筑师设计了一座具有正四面体形状的建筑。
2. 2. The crystals are tetrahedral in structure.
   这些晶体的结构是正四面体。
3. 3. The tetrahedral symmetry of the crystal is remarkable.
   这种晶体的正四面对称性令人印象深刻。