That's examples of deductively valid arguments.

这是演绎有效论点的例子。

The teacher deductively inferred this formula again in class.

老师在课堂上把这个公式重新推演了一遍.

This is a deductively valid argument and its truth preserving and therefore it is very, very useful.

这是个演绎的有效论点，保留了真理,所以非常有用。

Good, we then looked at some examples of arguments that are deductively valid in virtue of their form.

好，我们看着一些论点,通过它们的形式演绎有效。

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.

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。

So the fallacy of fast talking, and the list of fallacies are down there just for you amusement Okay here's a fallacy, well deductively valid argument and here's a fallacy that looks like it.

快速谈话的谬论，谬论的清单是供你们娱乐的,这里有个谬论，演绎的有效论点,有谬论看起来像。