Factor Xa, with Factor Va as a cofactor, turns factor II (also called prothrombin) into factor IIa or thrombin.

活性因子Xa和作为辅因子的因子Va将因子II（凝血酶原）转变为因子IIa（凝血酶）。

Thrombin also turns factor XIII into factor XIIIa which cross links the fibrin to form a stable clot.

凝血酶也能使因子XIII转变为因子XIIIa；因子XIIIa与纤维蛋白通过交叉连接形成稳固的血凝块。

Suppose they say yes, that could be the turning factor.

假设他们说是，那可能是转折因素。

I decided to turn all these factors into a math equation, although I'm not as good at math as I wish.

我决定将所有这些因素转化为一个数学方程式，尽管我的数学不如我希望的那么好。

Thrombin then turns factor I or fibrinogen, which is soluble, into factor Ia or fibrin, which is insoluble and precipitates out of the blood at the site of injury.

之后凝血酶将可溶的因子I（纤维蛋白原）转变为因子Ia（纤维蛋白原），纤维蛋白不可溶，便在损伤部位从血液中析出。

Tissue factor turns inactive factor VII into activate factor VIIa (a for active), and then tissue factor goes on to bind the newly formed factor VIIa to form a complex that turns factor X into active factor Xa.

组织因子使无活性的因子VII转变为活性因子VIIa，之后组织因子结合新形成的因子VIIa，形成一个复合物将因子X转变为活性因子Xa。