单词：leaf vein
leaf vein的用法和样例：
例句
- Venation is the distribution of veins in a leaf.脉序是叶片中各叶脉的排列分布状态。
- The secretory canals in the stem pith and above the leaf xylem were developed from ground meristem.茎髓中和叶脉木质部上方的分泌道来源于基本分生组织。
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