The function of the beginning of argumentative essay:

(1) Cut to the chase and put forward the central argument.

(2) in view of a phenomenon (or case or point of view) in reality, and then put forward an argument (or topic), with

Have a strong pertinence

(3) Quote famous sayings to put forward arguments or topics, and famous sayings are arguments to prove the arguments.

(4) An argument or topic comes from a story or an example, and at the same time, the story and the example are arguments to prove the argument.

⑤ Put out wrong arguments and arguments and set goals for the following refutation.

6. Use vivid metaphors or stories (such as fables) to draw arguments, which can not only stimulate readers' interest in reading, but also put abstract ideas.

Scientific visualization is easy for readers to accept.