milk vein

例句：

1. 1.The milk veins in the cow's body are visible through its skin.
   牛体内的奶脉可以通过皮肤看到。
2. 2. The doctor examined the patient's blood vessels and found a milk vein in his arm.
   医生检查了病人的血管，在他的手臂里发现了一个奶脉。
3. 3. The scientist discovered a new vein in the ocean floor that connects to the Milky Way.
   科学家在海底发现了一条新的静脉，它连接着银河系。