How to use dashes in composition topics?

2. Continuation of sound;

3. The beginning and end of time and space;

4, used as a note;

5. Strengthen key points;

6. Examples of branches;

7, used in front of the subtitle;

8. Indicate the author.

Extended data:

Dashes are widely used. First, they are used to introduce explanatory sentences, and second, they are used to express sudden changes in semantics and the lengthening of sounds.

The definition of dashes in government documents in different periods is as follows:

A dash -(A) indicates a sudden change of meaning. (b) indicates a pinch note. Same usage as brackets. (c) Summarize the above paragraphs. Similar to ":". (19 19 "Proposal on Promulgating New Punctuations")

Dashes are used to indicate grammatical breaks (that is, the marked sentences are inconsistent with the contextual mood; Without this sign, it is obviously ungrammatical) or suddenly turn; Sometimes used to indicate brackets, equal to brackets. (1930 "Measures of the Ministry of Education for Unified Document Format of Educational Institutions")

A dash (-) indicates that there is a description section at the bottom. A meaningful leap. (punctuation is used in 195 1 year)

Dashes indicate statements explained in the text. In addition, dashes have other uses: to express a sudden change of topic, to express an extension of sound, and to list and share matters. (1990 punctuation usage)

Dashes are widely used. First, they are used to introduce explanatory sentences, and second, they are used to express sudden changes in semantics and the lengthening of sounds.