1. A substance that prevents the clotting of blood. 
   抗凝血剂防止血液凝结的物质
2. An agent that promotes the coagulation of blood. 
   促凝剂促进血液凝结的媒剂
3. discolored by coagulation of blood beneath the skin. 
   因为血液在皮肤下面凝结而改变了颜色。
4. tiny bits of protoplasm found in vertebrate blood; essential for blood clotting. 
   脊椎动物血液中产生的微小原生质；血液凝结的必要元素。
5. Any of several hereditary blood-coagulation disorders in which the blood fails to clot normally because of a deficiency or an abnormality of one of the clotting factors. Hemophilia, a recessive trait associated with the X-chromosome, is manifested almost exclusively in males. 
   血友病遗传性血凝病中的任何一种，由于某个凝血因子的功能丧失或紊乱而造成血液不能正常地凝结成块。作为与ｘ染色体相关联的隐性性状，血友病几乎全都出现在男性患者身上

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• 1. 凝血因子
  凝集原 agglutinogen...凝血因子 blood clotting factor, coagulation factor...O
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