单词：bundle sheath
bundle sheath的用法和样例：
例句
- The veins of leases are parallel, and the vascular bundles have bundle sheaths.平行脉序，维管束具有维管束鞘。
- 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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