lateral vein of the first order

例句：

1. 1.The scientist observed the lateral veins of the plant to determine its growth patterns.
   科学家观察了植物的侧面血管以确定其生长模式。
2. 2. The doctor carefully removed the lateral veins from the patient's arm to prevent infection.
   医生小心翼翼地从病人的手臂上移除侧面的血管以防止感染。
3. 3. During the surgery, the surgeon carefully dissected the lateral veins to avoid damaging them.
   在手术期间，外科医生小心地解剖侧面的血管以避免损伤它们。