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汉语拼音：yè mài

叶片上分布的细管状构造，主要由细而长的细胞构成，分布到叶片的各个部分，作用是输送水分、养料等。

叶脉 [yè mài]

1. 植物叶片上分布的维管束。有主脉、支脉、细脉之别，为强韧纤维所成，有支持叶片及输送水分、养料之用。其分布的形状各有不同。也称为「叶筋」。

叶脉 [yè mài]

1. 植物叶片上网状的脉纹，即维管束。有主脉、支脉、细脉之别，为强韧纤维所组成，有支持叶片及输送水分、养料的功能。可分为平行脉、网状脉两大类。 

   【造句】叶子经过处理之后，可制成叶脉书签。

• Another is by cutting a path all the way across the leaves to hold the flow of chemicals. Then they simply eat between the veins of poison.

  它们还可以通过切断整个叶片来阻止有毒化合物的流动，然后它们只吃在有毒叶脉之间的叶片。

• 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。

• Napian buds, in my pay, finally stuck his head. Under the sun, about two swaying verdant bud, dew dripping down along the vein.

  那片嫩芽，在我的付出之后，终于探出了脑袋。阳光下，两片嫩绿的幼芽左右摇曳，露珠顺着叶脉滴落而下。

• Vein One of the vascular bundles in a leaf. The pattern in which the veins are arranged in a leaf is called the VENATION.

  叶片中的维管束结构。在叶片中，所有叶脉排列的方式称脉络。

• However, it can take a beetle an hour and a half of careful vein cutting to prepare a small leaf that takes it only a few minutes to eat.

  然而，切断叶脉来准备一份只用几分钟就吃完的晚餐需要甲壳虫一个半小时的小心工作。

• Out of the xylem, there is lot of fiber and the tannin crystal distributes around the air cavity.

  叶脉中厚壁组织发达，木质部外纤维数量众多，在气腔周围有单宁结晶分布。

• The little snail was dry and thin. He looked like firewood but for a shell. The leave were full of holes and ther.

  小蜗牛又干又瘦，要不是有个壳，看起来像一段干柴。叶子也千疮百孔了，好些地方只剩黄黄的网状叶脉。

• The distance between the veins is a measure of how well the veins are keeping the leaf supplied with water and nutrients.

  叶脉间距是测量叶脉如何有效地为树叶提供水分和营养的一种方式。

• A yellow brittle small pieces of paper, an old photograph, a permeability of the veins bookmarks, the changes in time, to become debris.

  一页发黄变脆的小纸片，一张老照片，一片通透的叶脉书签，都在时光的变幻中，成了残骸。