单词：secondary bast
secondary bast的用法和样例：
例句
- The secondary phloem consisted of sieve cells and phloem parenchymas.根的次生韧皮部则由筛胞和韧皮薄壁细胞组成。
- In the secondary phloem of Tree Peony metaphloem was dominative in the root's secondary structure, which was just opposite to Herbaceous Peony.根次生结构，牡丹根次生韧皮部占主要部分，而芍药根次生木质部占主要部分。
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