1. The porcupine's spines are sharp and can easily pierce through skin.
豪猪的刺非常尖锐，可以轻易刺破皮肤。

2. The cactus is covered in spines to protect itself from predators.
仙人掌上长满了刺，以保护自己免受捕食者的伤害。

3. The book had a cracked spine, making it difficult to open and read.
这本书的书脊裂开了，使得打开并阅读变得困难。

4. The fisherman carefully removed the spines from the fish before cooking it.
渔夫在烹饪鱼之前小心地移除了鱼身上的刺。

5. The hiker felt a sharp pain in his foot as he stepped on a hidden spine.
当徒步旅行者踩到一个隐藏的刺时，感到脚上一阵剧痛。

6. The hedgehog curled into a ball, protecting itself with its spines.
刺猬卷成一团，用刺来保护自己。