layeragen.压条法layern.层vi.分层vt.将某物堆积成层layering propagation压条繁殖layered architecture分层体系结构layer-three switch三层交换机layerage by notching切伤压条法layer classification分层layer plating method夹层培养法layered test-bench层次化验证平台layered system model分层系统模型Layered distribution层次分布layered back-trace分层回溯