This is the Taoist way of keeping in good health (Neidan), which roughly means practicing every day (the simplest method is meditation, the specific method is similar to what you see on TV, but your eyes should be slightly closed, your hands should be placed on your abdomen, your heels should be pressed on your anus, and you should sit still for about 30 minutes every day). After a long time (about five years), you won't have nocturnal emission, because the turbid semen that should have been excreted will be transformed into sperm that is beneficial to people. If you continue to practice, Neidan will breed in your body, which is the so-called fetus (not a child ...), which is the "God" mentioned above. If you continue to practice, you will find that you can control the qi in your abdomen and then guide this air flow throughout your week. If we continue to nurture Neidan with this spirit, we will reach the realm of Tao after a long time. I don't know where you saw it, except for the health preservation mentioned above. Dialectical sayings such as "Extraordinary Tao", anode produces yin, cathode produces yang, everything has its opposite, and so on. As for the meaning, if it is not a professional translation, it is self-evident, and there is no need to find fault. Typing is very tiring, please accept it, thank you.