piriform

例句：

1. 1.The shape of the new building is piriform, with a concave roof and a flat floor.
   这座新建筑的形状是多面形的，有一个凹面屋顶和一个平面地板。
2. 2. The researcher found that the piriform structure of the fossilized shells was consistent with the ancient marine environment.
   研究人员发现化石贝壳的多面形结构与古代海洋环境是一致的。
3. 3. The artist's use of color and form in her paintings has a piriform quality, reflecting boththe natural world and human experience.
   这位艺术家在她的绘画中使用颜色和形式时具有多面性，既反映了自然界也反映了人类经验。