inferior rectal veins

例句：

1. 1. The surgeon performed a complex procedure on the patient's lower rectal veins.
   外科医生对患者的下直肠静脉进行了复杂的手术。
2. 2. The study found that the inferior rectal veins were responsible for carrying waste from the colon to the bladder.
   研究发现，下直肠静脉负责将结肠中的废物输送到膀胱。
3. 3.During surgery, the surgeon carefully dissected the inferior rectal veins to avoid damaging the blood vessels.
   在手术过程中，外科医生小心地解剖下直肠静脉，以避免损伤血管。