9 This is not surprising since a phrase with non-terminal X (e.g., the X on the source side) may be further specified as multiple phrases with various nonterminals (e.g., the C, the C/A1, etc.).
the average number of phrases per sentence (in English test data, hereafter) increases from 453 to 893 while the decoding time of the SMT decoder increases from 0.11 seconds to 0.19 seconds per sentence on average.