leaf spine

例句：

1. 1. The plant has a unique leaf spine that helps it to climb up trees.
   这种植物有一个独特的叶刺，帮助它攀爬树木。
2. 2. The scientist observed the leaf spines of the plant and noted their shape and size.
   科学家观察了这种植物的叶刺，并注意到了它们的形态和大小。
3. 3. The leaf spines are made of calcium carbonate and provide protection for the plant's leaves.
   叶刺是由碳酸钙制成的，为植物的叶子提供保护。