Hemophilia is a rare blood disorder, and people born with this condition have little or no clotting factor, a protein that controls bleeding.

血友病是一种罕见的血液疾病，遗传这种病的人极少或没有凝血因子，这些正是一种控制出血的蛋白质。

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Hemophilia can be mild, moderate, or severe, depending on how much clotting factor is present in one's blood.

血友病可以是轻微、温和的，或者是剧烈的，这是根据人体血液里凝血因子的多少而定。

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And Dr Tsien has even modified the dye to respond to other molecules, such as a blood-clotting factor called thrombin.

钱博士又改良了染色颗粒使之对其他的分子也能产生作用，比如被称作凝血酶的血液凝固因子。

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