secondary tin再生锡secondaryadj.次要的；从属的；中等教育的n.副手；次要位置secondary drowning继发性淹溺secondary gonopore阳茎口,次生生殖孔secondary pleurisy继发性胸膜炎secondary elevator二级升降器secondary tubercle中疣(动)secondary papillae次级乳头secondary inverter二次逆变secondary entrance次要人口secondary producer次级生产者secondary insomnia继发性失眠、次发性失眠

1. 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。
2. 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。