So if we see the conclusion of a valid argument is false what do you know? A little bit longer.
如果我们看到有效论点的结论为假，你们知道什么？有一点长。
Actually a valid argument doesn't have true premises and true conclusion what is a valid argument?
实际上一个有效论点没有真前提和真结论，什么是有效论点呢？
So it's a valid argument but has false premises. Okay what about if it is an invalid argument with false premises.
这是个有效的论点但是有假前提，如果是无效论点有假前提呢？
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.
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。
When executing the script containing getopt, named opttest, using a valid argument of -x-or --xxxxx, getopt recognizes the switch and executes the code within the case switch
在执行包含getopt（称为opttest）的脚本时，如果在 -x 或 --xxxxx 中使用有效的参数，getopt 会识别出开关并执行 case 开关中的代码
Supporters of each candidate have a valid argument to make, but shouldn't they have the benefit of being able to consider postseason performance in making their determination?
每位候选人的支持者们为了各自的偶像相互之间争论不休，既然这样他们为什么不将季后赛各人的表现考虑在内呢？
So if you negate that conclusion and took away the therefore, if you negated that conclusion the set would be inconsistent wouldn't it? And that shows you that that's a valid argument.
如果你否认结论，把所以拿掉，那么，如果你否认结论，这就不一致了，不是吗？这显示这是一个有效论点。
A good deductive argument is sound if and only if it's both valid and has true premises.
一个好的演绎论点是完好的，如果且仅如果这些都有效，并且前提为真。
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 circular argument is always valid and what tells you is that there got to be more to a good argument than validity.
所以循环论点都有效，告诉你们，好论点，比为真有更多要有的。
Could this argument be valid say yes - as a matter of fact this argument must be valid.
这个论点有效，说对-，实际上这个论点肯定有效。
But I don't want it to be persuasive because of a fallacy I actually want it to be a good argument as well, so I want it to be sound and valid.
但是我不想让他因为一些谬论更加有说服力，我实际上想让它成为更好的论点，所以我想让他完好有效。
Is the argument in favor of promoting diversity a valid one?
这样的争论是不是倾向于把推行多样化变成合理的呢？
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。
Now that looks like a deductively valid argument doesn't it?
这看起来像演绎有效的论点，不是吗？
So it's a sufficient condition for an argument being valid that there is no possible situation where the premises are true and the conclusion false. And that's a necessary condition too.
所以这对于论点有效性是充分条件，没有可能前提为真，结论为假，这是必要条件。
Here's a second example of begging the question, in which a dubious premise which is needed to make the argument valid is completely ignored: "Murder is morally wrong."
第二个例子，在这里令人怀疑的、结论所需要的前提，被忽略了。
Because most tools take standard input as an argument using a hyphen (-), even the argument for using cat to intersperse multiple files with stdin is often not valid.
由于大多数工具都接受使用连字符(-)的标准输入作为一个参数，因此即使使用cat来分散stdin中的多个文件，参数也通常是无效的。
The name-check function returns "True" if its argument input PATHNAME is valid for a particular operating system or file system.
如果其参数输入PATHNAME对于特定的操作系统或文件系统有效，名称检查函数将返回“True”。
IllegalArgumentError is thrown every time an argument is not considered valid, for example, when a null value is passed to a method as a parameter.
IllegalArgumentError在每次认为参数无效时抛出，例如，将null值作为参数传递给方法。
The argument values passed into a method of the Publishing Label Repository module were not valid.
传递到发布标签知识库模块的某个方法中的参数值无效。
Make sure each argument is a valid expression that evaluates to a data type convertible to the type the procedure defines for the corresponding parameter.
确保每个参数是有效的表达式，而且计算得出的数据类型可以转换为该过程为相应参数定义的类型。
These functions must be called after the stream has been opened(obviously, since each requires a valid file pointer as its first argument) but before any other operation is performed on the stream.
这些函数必须在流打开后被调用（很明显，因为每个函数都需要一个有效的文件指针作为它的第一个参数），但是在对流有任何操作之前。
These functions must be called after the stream has been opened(obviously, since each requires a valid file pointer as its first argument) but before any other operation is performed on the stream.
这些函数必须在流打开后被调用（很明显，因为每个函数都需要一个有效的文件指针作为它的第一个参数），但是在对流有任何操作之前。
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