As it is very hard to find all of the words in the original corpus that would be found meaningful by a Chinese person, it is very hard to count recall in the traditional way, that is, the number of meaningful words extracted divided by the number of all meaningful words in the original data.
it is also impossible to approach traditional precision and traditional recall by comparing the hand-segmented sample sentences and the automatically segmented sentences, as people usually do, because our method does not touch upon segmentation.