What does the word "into the population" mean in the old calendar book?

1, into the population: refers to the adoption of adopted sons or daughters; It can also refer to the day when you can have a baby by caesarean section, or hire employees.

2. Suitable crowd: a day suitable for adopting children or children.

There are some technical terms in the solar calendar, such as "marriage", "sleeping" and "prayer". Each special term has a different meaning.