pyriform apparatus

例句：

1. 1. The pyriform shape of the saucepan is perfect for cooking.
   这个平底锅的形状非常适合烹饪。
2. 2. The pyriform roof of the building provides excellent protection from the rain.
   建筑物的扁平屋顶提供了很好的防雨保护。
3. 3. The pyriform structure of the tree trunk is a testament to its strength and durability.
   树根的扁平结构是其强大和耐用性的证明。