investigation
  調查,審查,研究
  In·ves·ti·ga·tion n.  The act of investigating; the process of inquiring into or following up; research; study; inquiry, esp. patient or thorough inquiry or examination; as, the investigations of the philosopher and the mathematician; the investigations of the judge, the moralist.
  ◄ ►
  investigation
       n 1: an inquiry into unfamiliar or questionable activities;
            "there was a congressional probe into the scandal" [syn:
             probe]
       2: the work of inquiring into something thoroughly and
          systematically [syn: investigating]