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近义词与同义词
按词义分组列出，使用时请结合具体语境。
a relatively thin sheetlike expanse or region lying over or under another
(construction) a layer of masonry; "a course of bricks"
a structure consisting of a room or set of rooms at a single position along a vertical scale; "what level is the office on?"
an abstract place usually conceived as having depth; "a good actor communicates on several levels"; "a simile has at least two layers of meaning"; "the mind functions on many strata simultaneously"