layer/ˋleɚ; ˈleIə/n [C]1 an amount or piece of a substance that covers a surface or that is between two other things〔覆盖表面的〕层﹔〔两物之间的〕一层: +of a layer of dust 一层灰尘thin/thick layer 薄薄的/厚厚的一层top/bottom layer 顶/底层2 one of several levels in a complicated system〔复杂制度中的〕层次﹔阶层: +of We have fewer layers of management. 我们的管理层少了。OZONE LAYER