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ADJ (of a vascular bundle) having two phloem groups to the inside and outside, respectively, of the xylem ( 维管束)双韧的 [botany]
Bicollateral bundle the arrangement of tissues in the vascular bundles in which the phloem is situated on both sides of the xylem.
是初生木质部的内，外方都有初生韧皮部分布的一种维管束排列方式。
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