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Statistical machine translation based on hierarchical phrase alignment.

This paper describes statistical machine translation improved by applying hierarchical phrase alignment. The hierarchical phrase alignment is a method to align bilingual sentences phrase-by-phrase employing the partial parse results. Based on the hierarchical phrase alignment, a translation model is trained on a chunked corpus by converting hierarchically aligned phrases into a sequence of chunks. The second method transforms the bilingual correspondence of the phrase alignments into that of translation model. Both of our approaches yield better quality of the translaiton model.