分层模式提供了支持某一产品线策略所必需的整个体系结构的结构，它将可重用和特定于平台的软件要素分离成不同的层。
Layers provided the overall architectural structure required to support a product-line development strategy by separating reusable and platform-specific software elements into different layers.
分层模式为软件体系结构提供了总体的基础结构，以支持项目的产品线开发策略。
pattern gave the overall, fundamental structure to the software architecture to support the project's product-line development strategy.
方法采用分层整群随机抽样方法，询问调查抽中的广州市1级、2级和3级医院的一线临床医生。
Methods a questionnaire survey was conducted among the clinical doctors selected by stratified cluster random sampling from grade 1, 2 and 3 hospitals in Guangzhou.
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