plaque

/plæk/

名词

齿菌斑，牙斑
Bacteria attaches to the surface of teeth and forms plaque.
细菌附着在牙齿表面并形成牙菌斑。
铭牌；匾牌
The First Lady unveiled a commemorative plaque.
总统夫人为一块纪念匾牌揭了幕。