To make leaf vein with sharp work stick.
用尖棒在叶片上划出细密直纹。
The structure of leaf vein is complicated.
叶脉结构较为复杂，主脉发达。
Vein density is a sign of how much a leaf has invested in the network.
叶脉密度标志着树叶在这个网状结构中投入了多少。
Vein density is a sign of how much a leaf has invested in the network.
叶脉密度标志着树叶在这个网状结构中投入了多少。
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