Come può una traduzione essere “radicale”?

In analytical philosophy a translation is "radical" when we try to translate a sentence from a completely unknown language. However, understanding another person always requires a radical interpretation, whether she speaks our native tongue or a language we do not know. In this second sense, "radical" describes a kind of inquiry that leads us to the root of the problem of linguistic meaning. The purpose of this paper is to show that the philosophical question on translation is "radical", precisely because it concerns the conditions of possibility of translating.