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What do two angle brackets mean?
Hello, two angle brackets (

Parentheses are usually used where the article needs comments, and the comments are sandwiched in the middle of the text. Write an article to a place that is difficult to understand. In order to make readers understand this place, you should add notes, or change the order of operations in mathematical operations, and also use parentheses.

Although annotations have many attributes. But the brackets can only explain the previous content, and can't introduce new content.