有效性是逻辑学家的兴趣，因为有效性保存真理。

Validity is an interest to logicians because validity preserves truth.

youdao

我们需要准确指出答案在技术文档中的出处，所以如果任何人怀疑考试的有效性，可以提供证明它有效的证据。

We need to source exactly where in the technical documentation the answer appears, so that if anyone challenges the validity of the exam, its validity will stand up in court.

youdao

有些人说归纳有效性,和演绎有效性，如果这样,那么他们在用两种不同意义的有效性。

Some people do talking about inductive validity and deductive validity and if they do then they are using valid in two different senses.

youdao

And says, OK, that effectively means that the market is memoryless.

并且说，这种有效性的意思就是说,市场是无记忆性的。

麻省理工公开课 - 计算机科学及编程导论课程节选