Vein One of the vascular bundles in a leaf. The pattern in which the veins are arranged in a leaf is called the VENATION.
叶脉：叶片中的维管束结构。在叶片中，所有叶脉排列的方式称脉络。
Vein One of the vascular bundles in a leaf. The pattern in which the veins are arranged in a leaf is called the VENATION.
叶脉：叶片中的维管束结构。在叶片中，所有叶脉排列的方式称脉络。
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