名词
中文翻译：牙间
同义词：
['interdental space', 'interdental papilla', 'interdental ridge']
例句：
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1. The dentist advisedhim to have the eustachium cleaned regularly.
牙医建议他定期清洁牙间。
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2. The patient complained of a soreness in the eustachium.
病人抱怨牙间疼痛。
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3. The eustachium is where the teeth meet, and it can be a source of pain.
牙间是牙齿相接触的地方，它可能是疼痛的来源。