Secondary structures的用法和樣例：
例句
- The primary and early secondary structures are similar to those of most herbs of the dicotyledons.
其初生結構和早期的次生結構類(lèi)似于一般的草本雙子葉植物根。 - In the secondary phloem of Tree Peony metaphloem was dominative in the root's secondary structure, which was just opposite to Herbaceous Peony.
根次生結構，牡丹根次生韌皮部占主要部分，而芍藥根次生木質(zhì)部占主要部分。
