15. The computer-implemented method of claim 14 , wherein each selected second translation being selected based on a measure of absence of matching words in one or more corresponding selected translations from the second text corpus includes scoring translations higher for selection that have more words not found in the one or more corresponding selected translations from the second text corpus.
16. The computer-implemented method of claim 15 , wherein the subset determined based on the machine translation accuracy scores includes including translations having machine translation accuracy scores within a predetermined ratio of accuracy as compared to the 1-best translation.