The ancient people considered the blood,amnionic fluid,lochia and etac as filthy and ominous materials,which will desecrate the inviolability,and drew up much abstinence of lunaria and birth.

古人认从女阴里流液、羊水、胎衣等是污、不祥,会亵渎神,之制订种种月经禁忌和生育禁忌。