coated
adjective uk/ˈkəʊ.tɪd/ us/ˈkoʊ.t̬ɪd/
厚厚一层的;涂着一层的;覆盖着一层的
thickly covered
Your trousers are coated in mud! 你的裤子上满是泥巴！
（常指因病）舌苔灰白的，舌苔厚的
If your tongue is coated, it is covered with a layer of a greyish-white substance, often because you are ill.