英语语法分析

Nobody can impugn his ability.

没有人对他的能力表示怀疑。

I wish in no way to impugn the potential validity of gradualism.

我想我绝不非难渐进论的潜在有效性。

And of course, they rightly impugn all meat, not just "red" meat.

当然，他们正确地抨击所有肉类，而不仅仅是红肉。