before_sent:  We  find that these "tails" are the major cause of anisotrpy of the vector space.
before_sent_with_intent: <meaning-changed>  We  find that these "tails" are the major cause of anisotrpy of the vector space.
after_sent:  We find that these "tails" are closely related to the positional information. We also investigate what will happen if we "cutting the tails" (zero-out). Our results show that "tails" are the major cause of anisotrpy of the vector space.