To prove that factor a has no effect whatever on outcome b may be important in the sense that it refutes a hypothesis.

证明因素 a 对结果 b 没有任何影响可能是重要的，因为它驳斥了一个假设。

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The rhesus factor protein is the next most important one after the a and B proteins.

该恒河猴因子蛋白是未来最重要的一后，A和B的蛋白质。

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Objectives To study the expression of surfactant protein B(SP-B)and thyroid transcription factor 1(TTF-1)and evaluate the role in neonatal hyaline membrane disease(NHMD).

目的探讨表面活性蛋白B（SP-B）与甲状腺转录因子（TTF-1）在新生儿肺透明膜病中的表达及其意义。

youdao

Without intrinsic factor, vitamin B-12 can't be absorbed and leaves your body as waste.

CNN: Vitamin deficiency anemia

Former X Factor star Misha B has scored her first top 10 hit with Do You Think Of Me.

BBC: Robbie Williams

The holiday season is (a) upon us and (b) often the deciding factor in whether a given brand had a successful year or not.

FORBES: Competition Promises To Be Fierce For Brands This Holiday Season