As the number of syntactic features decreases, more rules can be unified together.
the number of pre-ordering rules and reordering rules, as shown in   Table 7 shows the final translation accuracies under BLEU score (Papineni et al., 2002) and RIBES 12 , i.e., the software implementation of Normalized Kendall's τ as proposed by (Isozaki et al., 2010a) to automatically evaluate the translation between distant language pairs based on rank correlation coefficients and significantly penalizes word order mistakes.