Colon is one of the common punctuation marks in writing;

1, the English half angle is ":"

2. The whole English angle is ":"

3. Chinese full width ":"

4. The Chinese half angle is ":"

It usually means a pause after a hint or a hint below or a summary above.

In mathematical language:

1, indicating the ratio relationship between them, such as 1: 2, x:y, f (x): g (y);

2. Represents the two-point product of two union vectors, such as AB: CD = (a c) (b d).

How to use colons and examples?

Colon is one of the commonly used punctuation marks in writing, which usually means pause after prompt, prompt below or summary above. Next, share the usage and examples of colon.

First of all, after the address used in letters and speeches, it means to mention the following.

Example:

1, dear mother:

2. Dear teacher:

Two, in the interview, debate, discussion, court trial and other records of the speech after indicating the name of the speaker, in order to lead to the content of the speech.

Zheng Fang Jinling: Please don't get me wrong. What I said is not suitable for tourism, not that it is not suitable for developing tourism; Chloe Wang: I don't see any difference between these two questions.

Third, after being used for suggestive words, it means to mention the following. Verbs such as "ask/answer, say, think, yes, just write, think, prove, instruct, point out, for example" can be added with colons to make them suggestive and lead to the object. For example:

Example: Gorky said, "Books are the ladder of human progress."

Fourth, it is used after general discourse to lead to arguments.

For example, excellent films attending National Day gifts, such as Storm, Song of Youth and Lin Zexu, will also be shown in major cities.

Fifth, summarize the above before using it in general discourse.

Example: Zhang Hua was admitted to Peking University and studied in the Department of Chemistry; Ping Li entered a secondary technical school, majoring in mechanical manufacturing; I work as a shop assistant in a department store: we all have a bright future.

6. After the words that need to be explained, it means that the following is an explanation.

Example: The first Guangxi (Guilin) Book Fair will be held grandly.

Organizer: Guangxi Press and Publication Bureau

Book Fair Time: 1 998101October15.

Venue of the book fair: Guilin Gymnasium (Press 1998.09.29)

Seven, separate the author and the name of the work.

Example: Lu Xun: "Flowers pick up in the morning."

Eight, separate the subject words in the topic from the supplementary part of the explanation.

Example: thinking is proved by doing: thinking and doing are closely linked.