2. The upper part is the tissue that separates the oral cavity from the nasal cavity. Commonly known as loading or loading.
3. Standard expression: the mandible (singular) is a pair of conical hard structures located behind the upper lip, with incisor leaves at the front end for cutting and tearing food, and molar leaves at the back end for grinding food. The maxilla has powerful adductor muscles and smaller abductor muscles. The contraction of the two muscles enables the maxilla to move left and right, and the two maxillae are generally not completely symmetrical.
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