intervein

例句：

1. 1. Thedoctor carefully examined the patient's intervein to determine the cause of hispain.
   医生仔细检查了患者的血管以确定他疼痛的原因。
2. 2. The scientist discovered anew vein in the ocean floor that couldbe used for oil extraction.
   科学家在海底发现了一种新的血管，可以用来提取石油。
3. 3. Theresearcher found that the interveinof the heart is responsible for regulating blood pressure.
   研究人员发现心脏的血管负责调节血压。