But the very end of such a network, the leaf, has a different architecture. Unlike the xylem and phloem, the veins in a leaf cross-link and loop.
但网络的最边缘——叶子，却具有不同的结构，与木质部和韧皮部不同，叶子的纹路交叉并成环。
“It just keeps getting better and better, ” said Justin McNaughton, amongthe 20, 000 people who have reserved a Leaf. “My wife thinks it’s funny becauseat the end of the day, we’re just buying a car.”
已经有20 000人预订了Leaf，尤斯廷.麦克诺顿（JustinMcNaughton）是其中之一，他表示：“情况只会越来越好，我妻子认为这挺有趣，因为在这天结束的时候，我们只是在买一辆汽车。”
She took off her sash and threw one end of it round the butterfly. The other end she fastened firmly to the leaf.
她解下腰带，把一端系在蝴蝶身上，把另一端紧紧地系在叶子上。
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