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The mouth has the functions of ingestion, mastication, taste differentiation, and secretion of digestive juice.
The mouth has the functions of ingestion, mastication, taste differentiation, and secretion of digestive juice.
正确答案：swallowing
标签：
动物解剖生理
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The digestive gland is the gland organ that can secretes the .
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The lips are covered with skin, its inner surface is lined with .