ora serrata

例句：

1. 1. The plant has ora serrata on its stems to protect it from predators.
   这种植物的茎上有花刺，用来保护自己免受捕食者的攻击。
2. 2. The thorny bush was a challenge for the hikers.
   这丛荆棘丛给徒步旅行者带来了挑战。
3. 3. The ora serrata on the leaves of the tree is a defense mechanism against herbivores.
   树叶片上的刺是对抗食草动物的一种防御机制。