[ C ] a flat piece of metal, stone, wood, or plastic with writing on it that is attached to a wall, door, or other object铭牌;匾牌
a plaque on the wall of a house that shows that someone famous once lived there名人故居标示牌;纪念匾
[ U ] a substance containing bacteria that forms on the surface of teeth齿菌斑,牙斑
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