Chemists can use a number of indirect measures as evidence to rule out certain mechanisms, but they are often unsure if the remaining mechanism is correct because there are many other possible mechanisms that they have not tested or even thought of.
化学家可以将诸多间接测量作为证据而排除某些机理，但他们往往不确定剩下的可能机理是否正确，因为可能存在许多其他机理，他们没有测试过，甚至没有想过。