The role of the dash here is to explain, indicating that the dash is followed by the explanation part.
What is the function of dashes?
, indicating that there is an explanation.
2, said the voice of the extension.
3, meaning conversion, jumping or turning.
4. it means to interrupt.
5. Strengthen key points.
6. Examples of branches.
7, used in front of the subtitle.
8. Indicate the author.
9. Supplementary explanation.
10, resulting in the following.
1 1, which means progressive.
12, which is to sum up the above.
13, indicating that the words are not finished.