The core concept of the model Driven Architecture — which can solve or alleviate the problems mentioned above — is the platform-independent model. Essentially, the MDA has three tiers.
模型驱动架构的核心概念——可以解决或减少上面提到的问题——是平台无关模型(platform - independent model)。
The framework of the system adopt three tiers architectures, based on B/S model.
该系统采用了基于B/S模式的三层架构作为系统实现的体系结构；
This model is composed of three tiers: data tier, application tier and presentation tier.
模型框架结构分为数据层、应用服务层和视图层。
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