Everything that is vigorous, extroverted, rising, warm and bright belongs to Yang; Relatively quiet, defensive, healthy, cold and dark belong to yin. In terms of heaven and earth, the weather is light and bright, and the atmosphere is heavy and turbid. In terms of fire and water, water is cold, nourishing subordinate yin, fire is hot, and inflammation belongs to yang. Just for yang, soft for yin; Straight for Yang, bending for Yin; The circle of dots is yang and the hook is yin; External yang, internal yin; The left is yang and the right is yin; The upper part is yang and the lower part is yin.
There are yin and yang among them. If you can really separate them, it is good to understand them.