layerover叠掩layern.层vi.分层vt.将某物堆积成层layer of optic nerve ganglionic视神经节细胞层layer of iris anterior limiting虹膜前界膜layer crystal sodium disilicate层状结晶二硅酸钠layered sodium manganese oxides层状钠锰氧化物layered nano-silver phosphate层状纳米银磷酸盐layer discrete cosine transform层式DCTlayer of olfactory nerve fibers嗅神经纤维层layered fertilization and sowing分层施肥播种layered space-frequency scheme分层空频接收方案layered mandatory access control分层次强制访问控制