ligation of internal hemorrhoid

例句：

1. 1.The couple had to undergo a surgical ligation of their genitals.
   这对夫妇不得不接受生殖器的手术结扎。
2. 2.The researcher discovered that the ligation of the nerves affected the animal's behavior.
   研究者发现，神经的结扎影响了动物的行为。
3. 3. The ligation of the blood vessels in the heart can lead to strokes.
   心脏血管的结扎可能导致中风。