This means that these attributes (with high appearance probability) do not affect the translation quality in a significant way.
although the appearance probability of the attribute "Colloquial expressions of Japanese verbs" is 8%, which is less than the attribute "Other colloquial expressions" and the attribute "Using named entities", the acceptability of the utterances with this attribute (J-C:2.65, J-E:2.41) is significantly worse than the average acceptability (J-C:3.62, J-E:3.43).