Porcupines use their spines to protect themselves.
豪猪用身上的刺毛来自卫。
Sea urchins are perhaps best known for their armor of spines.
海胆也许最出名的是它们的刺甲。
剌猬有很多剌。
他们的脊柱上下。
Hold the two books by their spines and try to pull them apart.
揪住两本书的书脊并尝试将它们分开。
Hold the two books by their spines and try to pull them apart.
揪住两本书的书脊并尝试将它们分开。
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