That's a quite difficult argument to pin down does it work or does it not work.

这个论证很难确定,是不是说得通。

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One of the reasons for thinking it's not clear whether the argument fails or not is because it's hard to pin down, where exactly did it go wrong?

并不能确定这个论证是否成立,的其中一个原因就是,我们很难确定,到底是哪里出了问题

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