plaque
/plɑ:k; ?@ plæk; plæk/ n
flat (usu round) piece of stone, metal or porcelain fixed on a wall as an ornament or a memorial （装於墙上作饰物或纪念物的石质、 金属或瓷制的）饰板（通常为圆形）
A simple plaque marks the spot where the martyr died. 有一块朴素的饰板用以纪念该烈士的殉难处.
plaque / plɑ:k; ?@ plæk; plæk/ n [U]
(medical 医) soft substance that forms on teeth and encourages the growth of harmful bacteria 牙斑
It is necessary to remove plaque by brushing one's teeth. 需刷牙以去除牙斑. Cf 参看 tartar1 1.