informaladj.非正式的；不拘形式的informal subculture非正式亚文化informal conference非正式的会议informal employment非正规就业informal clothes.日常的服装informal axiomatics非形式公理学Informal instiution非正式制度informal deterrence非正式威慑informal invitation非正式的邀请informal department非正规部门informal discussion非正式的讨论