Examples are as follows:

Can the fourth paragraph of the selected text be deleted? Why?

Answer: it can't be removed. Because this paragraph points out that tolerance should be principled and tolerant of people's shortcomings and mistakes. It is not only a supplement to the above arguments, but also expands the content to be discussed below, making the arguments of the article more comprehensive and sufficient, and the structure of the article more rigorous. Therefore, this paragraph cannot be deleted.

Can the added "all" be removed? Why?

Reference answer: No, the scope of "all" is limited, which shows that "this sentence" has both correct and wrong places, avoiding absoluteness and appearing objective and rigorous.