A projector shines a map of the vein network directly on the skin.
投影仪将静脉网络的分布图直接投射到皮肤上。
They discovered this by injecting fluorescent dye into leaves to see if the vein network could distribute the dye to all parts of a leaf that had been damaged.
他们的研究方法是，向叶片内注射荧光染料，看叶脉网络是否能够将染料输送到各处受损部位。
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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