No country should claim infallibility.

没有国家可以声称自己绝对正确。

I can't claim infallibility for this method.

我不敢说这方法绝对有效。

I can not claim infallibility for this method.

我不敢说这方法绝对有效。

I've finally nailed the myth of his infallibility, ie shown that he can make mistakes.

我终于揭穿了他‘一贯正确’的神话（表明他也会犯错误）。

Of course, the supposed infallibility of the market in allocating capital has been debunked.

当然，市场在资本配置中所谓的绝对正确性，已被证明名不副实。