What do you mean by three Chimonanthus praecox Grandmother Geng Yinding?

This is one of the techniques in the Book of Changes, that is, armor belongs to wood, water is needed, Geng belongs to gold, and Ding belongs to fire. Ding Huo can turn Geng Jin into water, giving birth to armor, and in the third winter, when it is cold, it needs fire to warm water to give birth to wood, and wood can make a fire, so it goes on and on, endless, and thus affectionate. That's what it means.