marginal bast
... 边缘缺口 emargintion; 边缘韧皮部 marginal bast; 边缘哨声 fringe howl; ...
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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。
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.
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