特别注意一下中心叶脉附近的区域。
Pay particular attention to the areas right near the center vein.
叶脉结构较为复杂，主脉发达。
我们在叶子上可以看到叶脉。
而一切基于叶脉。
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.
我相信，他用长长的喙刺穿植物迟钝的叶脉。
I believe he pierced the slow vegetable veins with his long beak.
他们发现叶脉循环既可提高效率，又可减轻损害。
They found that as well as improving efficiency, they also help to ameliorate damage.
叶脉中木质部比重越大，越有利于水分的传输。
叶脉中木质部比重越大，越有利于水分的传输。
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