placoid的翻译，读音

例句

Enamel A shiny hard material covering the dentine of teeth and the surface of some scales ( cosmoid and placoid scales). 珐琅有光泽的坚硬物质包覆在牙齿及一些鳞片（圆鳞与盾鳞）表面。

Dentine A hard mesodermal material in teeth and some scales (cosmoid, ganoid and placoid scales) produced by odontobasts. 齿质组成牙齿或某些鳞片（硬鳞与盾鳞）中层的坚硬物质。