25. The method of claim 15 wherein iteratively modifying the translation comprises performing at each iteration one or more modification operations on the translation.
25. The method of claim 15 wherein iteratively modifying the translation comprises performing at each iteration one or more modification operations on the translation. 26. The method of claim 25 wherein the one or more modification operations comprises one or more of the following operations: (i) changing one or two words in the translation; (ii) changing a translation of a word and concurrently inserting another word at a position that yields an alignment of highest probability between the source language text segment and the translation, the inserted other word having a high probability of having a zero-value fertility; (iii) deleting from the translation a word having a zero-value fertility; (iv) modifying an alignment between the source language text segment and the translation by swapping non-overlapping target language word segments in the translation; and (v) modifying an alignment between the source language text segment and the translation by eliminating a target language word from the translation and linking words in the source language text segment.