凝血素

例句：

1. 1. He was found dead in the pool of blood, with no sign of injury.
   他在血泊中被发现死亡，没有受伤的迹象。
2. 2. The doctor administered a hemostatic agent to stop the bleeding.
   医生给病人注射了止血剂来止血。
3. 3. The researcher discovered that the molecule responsible for clotting blood is called thromboxane.
   研究员发现负责凝血的分子被称为血栓素。