Why do people in China say that "there is no apostrophe in the eight characters"?

The word "eight characters" is a metaphor for things that haven't been done yet.

The first word of "eight" is "well", and the first word "well" is not written. How can there be a complete "eight"? At first, people used "eight characters not left" to describe the marriage between men and women. "Eight characters" refers to the date of birth of men and women.

In ancient times, the birthdays of both men and women had to be together (that is, not contradictory) before they could get married.

From: Chapter 29 of Legend of Heroes of Children: "Otherwise, my sister just thought, I dare to draw my sister and him on a picture before I have time to say anything?"

Extended data

There is no sign of anything happening yet.

I. Usage

As predicate, object, attribute, clause as predicate, object, attribute, clause.

Second, synonyms

There is no apostrophe in the eight characters, no apostrophe in the eight characters, no apostrophe in the eight characters.

Third, examples.

We are here to defend Yan 'an. Can Yan 'an give up? -Du Pengcheng is defending Yanan.