1. The branch of dentistry that deals with the study and treatment of periodontal disease. 
   牙周病学牙科的分支，主要研究牙周疾病的治疗
2. To fade out; vanish. 
   渐弱；消失
3. tending to vanish like vapor. 
   象水蒸气般易于消散。
4. To cause to vanish or disappear. 
   使消失，使散去
5. To pass out of sight; vanish. 
   消失；消逝

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