(noun.) thin structure composed of a single thickness of cells.
(noun.) a hen that lays eggs.
(noun.) single thickness of usually some homogeneous substance; 'slices of hard-boiled egg on a bed of spinach'.
(noun.) a relatively thin sheetlike expanse or region lying over or under another.
(verb.) make or form a layer; 'layer the different colored sands'.
手打:洛伊斯
录入:罗莎莉