He generates nearly-equivalent syntactic paraphrases of the source-side training sentences, then pairs each paraphrased sentence with the target translation associated with the original sentence in the training data.
from Table 3, it can be seen that the "Lattice" system achieves an improvement of 0.51 absolute (3.63% relative) BLEU points and a decrease of 1.6 absolute (2.14% relative) TER points compared to the baseline.