对，所以如果论点有效，一个演绎的有效论点中结论是假的，你就知道前提中有一项是假的。

That's right. So if you have a valid argument a deductively valid argument in which the conclusion is false then you know one of the premises must be false.

youdao

这是他告诉你结论是否有效，这是演绎有效的论点，这是一个谬论。

And that's what tells you whether the argument is valid or not So this is a deductively valid argument and this is a fallacy.

youdao

现在唯一重要的是你们要理解，什么事演绎的有效论点，也就是真理保留，如果前提是真的，结论必定是真的。

The only that that is important now is that you understand what a deductively valid argument is. That it is truth preserving, if the premises are true then the conclusion must be true.

youdao