calthrop

例句：

1. 1.The calthrop is a rare and valuable plant species.
   这种植物是稀有且珍贵的。
2. 2. The calthrop has been used in traditional medicine for centuries.
   这种植物在传统医学中被使用了几个世纪。
3. 3. The calthrop's unique features have made it a popular choice for gardeners.
   这种植物独特的特点使它成为园艺爱好者的热门选择。