名词短语
中文翻译：牙膏的流动
同义词：
['saliva flow', 'saliva stream']
例句：
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1.The dentist uses a special tool to control the flow of gum during the cleaning procedure.
牙医使用一种特殊的工具来控制清洁过程中牙膏的流动。
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2. The patient was instructed to keep his mouth open and allow the flow of gum to be removed.
患者被指示保持口腔张开，让牙膏的流动得以去除。
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3. The doctor explained that the flow of gum could indicate an underlying dental problem.
医生解释说，牙膏的流动可能表明一个潜在的牙科问题。