Spoken and Chinese standard first-class words (commonly used words). Ideographic characters, whose Oracle Bone Inscriptions is like an upward mouth shape, are meaningful in the upper part, so they are often used to refer to pronunciation. The original meaning is mouth, which is extended to the place where the container passes outward, the place where it enters and exits, and so on. Mouth is also a radical word.
"Kou" can be used alone or as a radical, which is the radical of Shuowen. Modern Chinese dictionaries still have the part of "mouth". Most Chinese characters related to "mouth" come from "mouth", such as kissing, eating, drinking and singing. "Mouth" can sometimes be used as a silent symbol, such as buckle and knock. Mouth+strength = addition, addition and subtraction, mouth+mouth = back, back, mouth+ten = leaf, leaf, mouth+gold = listening, listening and speaking, mouth+eight = only one, mouth+wood = apricot, apricot, mouth+door = inquiry, greeting, and so on.
The formula and the six books are pictographs, like the shape of a population. The word "mouth" written by Oracle Bone Inscriptions and Jin Wen looks like a person's mouth is open. Seal script is slightly similar to bronze inscriptions, but the shape is elongated up and down. In official script and regular script, the straight square fold is used instead of the circular fold of Xiao Zhuan, unlike the shape of the mouth. Its original meaning refers to the mouth. The word "Kou" in bronze inscriptions is used as clan characters. In ancient Chinese characters, "Kou" was usually written with two strokes, but it may have been written with three strokes in the Han Dynasty.