bicollateral
柯林斯词典
1. 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]
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1. 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]