What does "hidden pregnancy" mean? What does Zhu mean?

"Hidden pregnancy" was originally a marriage between a man and a woman or an intermarriage between two families. Nowadays, many women are instructed to get pregnant. Now refers to the sexual intercourse between men and women or the pregnancy of men and women (mostly unmarried men and women) due to infidelity.

[bead]: moral:. The substances secreted by Meretrix meretrix due to the stimulation of sand entering the shell are wrapped in layers to form round particles, which are milky white or yellowish and shiny, and can be used as decorations, here referring to fertilized fetuses.