这些刺都深深地嵌在植物的木纹状组织结构内，不会被轻易破坏。
Thorns are deeply embedded in the woody structure of the plant and can't be broken off easily.
核内再复制现象普遍存在于动物和植物中，在高代谢活性组织的细胞及最终进行高度分化的细胞中最常见。
Endoreduplication has been observed in many plant and animal species, and is documented toappear more frequently in tissues with high metabolic activity and highly differentiated cells.
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