细血管的英文：
vein

vein是什么意思：
n. 血管，静脉；纹理；叶脉；岩脉；性情
v. 使有脉络；象脉络般分布于

It is veined by railroads.
铁路线四通八达。

Radiography of veins or a vein after injection of a radiopaque substance.
静脉造影术在注入射线不能显著穿透的物质之后对静脉的放射线照相术

Varicose vein (or varix)：Twisted vein distended with blood.
静脉曲张:伴有血液潴留的静脉扭曲或扩张。

It has a rich and deep vein of limestone.
它有着储量丰富的深层石灰石矿脉。

The window was veined with cracks.
那窗户布满了道道裂纹。