These results show that 1) most of the paraphrases that are added in are lower-order n-grams; 2) the paraphrases can increase the coverage of the input by handling the unknown words to some extent.
we observed that most untranslated words in the "Para-Sub" and "Lattice" systems are still NEs, which shows that in our paraphrase table, there are few paraphrases for the NEs.