维管束鞘

vascular bundle sheath的用法和样例：

例句

It shows two well-developed sheaths around the vascular bundles.它显示出两个发育完全之维管束鞘位于维管束周围。
The spongy cell arranged densely.The vascular bundle sheat and the phloem were colored more red.维管束的导管口径变小，维管束鞘和韧皮部的细胞番红染色加重。

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