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双韧维管束
bicollateral vascular bundle[植] 双韧维管束;双韧型维管束
ectoxylar bicollateral bundle外木质复并立维管束
bicollateral vascul bundle双韧维管束
ectophloic bicollateral bundle外筛复并立维管束
amphiphloic bicollateral vascular bundle双韧皮并立维管束
ectocribral bicollateral bundle外筛双韧维管束
ADJ（形容词） (of a vascular bundle) having two phloem groups to the inside and outside, respectively, of the xylem ( 维管束)双韧的 [botany]