主要神经环的组织原已有详细描述。
The histology of the main nerve rings has been described in detail.
根的顶端原始细胞为圆锥状排列的原始细胞群，未见典型的组织原分区。
The apical initial cells of the root top were arranged in cone shape and no typical histogen zones were found.
根的顶端原始细胞为圆锥状排列的原始细胞群，未见典型的组织原分区。
The apical initial cells of the root top were arranged in cone shape and no typical histogen zones were found.
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