名词
中文翻译：血清凝血因子转化因子
同义词：
['serum prothrombin', 'prothrombin', 'thrombin']
例句：
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1. The patient's blood tests showed a low level of serum prothrombin.
患者的血液测试显示血清凝血因子水平低。
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2.The researcher found that the prothrombin level in the patient's serum was significantly lower than normal.
研究者发现患者血清中的凝血因子水平显著低于正常值。
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3.The doctor explained that the patient's prothrombin level was too low to allow for effective clotting.
医生解释说，患者的凝血因子水平过低，无法有效凝血。