名词
1. 层
A layer of a material or substance is a quantity or piece of it that covers a surface or that is between two other things.
2. 层次；阶层；等级
If something such as a system or an idea has many layers, it has many different levels or parts.
3. 分层放置
If you layer something, you arrange it in layers.
1. thin structure composed of a single thickness of cells
2. a hen that lays eggs
3. single thickness of usually some homogeneous substance
e.g. slices of hard-boiled egg on a bed of spinach
Synonym: bed
4. an abstract place usually conceived as having depth
e.g. a good actor communicates on several levels
a simile has at least two layers of meaning
the mind functions on many strata simultaneously
5. a relatively thin sheetlike expanse or region lying over or under another