名词
中文翻译：龈沟
同义词：
['gingival sulcus', 'gingival groove', 'gingival fissure']
例句：
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1. Thedentist had to remove the tooth and clean the gingival trough.
牙医不得不拔除牙齿并清洁牙龈沟。
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2.The patient's mouth was sore from the gingival trough infection.
病人的口腔因牙龈沟感染而疼痛。
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3.During the cleaning procedure, the dentist carefully removed any calculus from the gingival trough.
在清洁过程中，牙医小心地从牙龈沟中清除任何结石。