汉英词典
MEANING OF 叶脉
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叶脉有两种：平行脉和网状脉。 There are two kinds of venation, parallel and net . | ||
叶脉中木质部比重越大，越有利于水分的传输。 Large proportion of xylem benefit to the water transfer. | ||
缺铁的特征是嫩叶的叶脉之间萎黄。 Iron deficiency is characterized by chlorosis between veins in young leaves. | ||
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. | ||
因此叶脉——树叶的骨架决定了树叶是典型的枫叶形状还是尖刀似的柳叶形状。 So it's the veins — the skeleton of the leaf — which determine whether you will have a classic maple shape or a blade-like willow. | ||
但是最近的研究发现一种昆虫，这种属于甲壳虫类的昆虫可以为自己开辟一条避开这种植物防御系统的通路，方法是切断主要的向叶子传递毒液的叶脉。 But a recent study has found one insect, a beetle that can chew its way past the plant's defense system by cutting the main vein that delivers the poison to the leaves. | ||
