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- 内皮层皮层的最内层，在根、茎的导管组织周围形成一道叶鞘（茎衣）
The innermost layer of the cortex that forms a sheath around the vascular tissue of roots and some stems.
- 大脑绒被从软膜和大脑皮层之间穿过的极细的小血管形成的网
A network of extremely small blood vessels passing between the pia mater and the cerebral cortex.
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