vein [veɪn]

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n.血管，静脉；叶脉，纹理；情绪；vt.使成脉络

a tube that carries blood to the heart from the other parts of the body

The girl is not in the vein for singing today. 那女孩今天没有心情唱歌。
The doctor injects glucose into the patient's vein. 医生把葡萄糖注射入病人的静脉。