Each statement in a proof is logically justified by a definition, postulate, or an earlier proposition that has already been proven. 在一个证明过程中每一个陈述句都要被符合逻辑地用定义，定理或公理或前边已证明的命题加以判定。
It is not a logically compelling argument. 它在逻辑上并不是令人信服的理由。
These remarks are logically out of place. 从逻辑上看这种论述是不恰当的。
