Most have focused on extracting a translation lexicon by mining monolingual resources of data to find clues, using probabilistic methods to map words, or by exploiting the cross-language evidence of closely related languages.
most of them evaluated only highfrequency words of specific types (nouns or content words) (Rapp, 1995;Koehn and Knight, 2002;Haghighi et al., 2008;Garera et al., 2009;Laws et al., 2010) we do not consider any constraint on our test data and our data includes many low frequency words.