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。
2
The team discovered that a certain B. subtilis signalling molecule, known as competence and sporulation factor (CSF), is detected by human gut cells (Cell Host &Microbe, vol 1, p 299).