有总有分，信息详实全面，语言简练准确

definition;provide informtion

description;

process

comparison and contrast

cause and effect

2.introduction whadt you introduce

 body; detail

conclusion;what you have introduce

purpose to inform

              objective not accurate

      *** unity and coherence

key; not to be emotional

        too opinions no fcts

         not to argue

          no useful information

           constrc

         not objective