bundle sheath

• 维管束鞘

bundle sheath的用法和样例：

例句

1. 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。
2. 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。