Colons are punctuation marks. It usually means a pause after a hint or a hint below or a summary above. It is written as ":"in English and ":"in Chinese. Divided into Chinese and English half-width and full-width colons.
Function of colon:
1, used after salutation, means to mention the following. Comrades, let's have a meeting now. It often appears in letters and official documents. Some people often ignore this colon after the address form, which is easy to write as a comma.
2. After the words "say", "think", "yes", "prove", "announce", "for example" and "as follows", it indicates the following tips.
Precautions for using colons in extended data:
1. Pay attention to the prompt range when using colons. The contents of the colon prompt end with a period. If the contents before the period are not all prompted by colons, the use of colons is incorrect.
2. Don't use colons without special instructions.
You can't use colon in a sentence.
Colons are often used after "so-and-so" and "so-and-so". But sometimes you don't want to emphasize the prompt, or you don't quote others directly, so you use commas instead of colons. If "so-and-so said" comes after all quotations, use a period after "said".
Baidu Encyclopedia-Colon