The problem appears because of some shortcomings associated with the development methods, which cannot solve the separation among the presentation level, business logic level and data level.
这些问题的产生，是因为所采用的开发方法不能从根本上解决表示层与业务逻辑层、业务逻辑层与数据层相分离的问题。
The problem appears because of some shortcomings associated with the development methods, which cannot solve the separation among the presentation level, business logic level and data level.
这些问题的产生，是因为所采用的开发方法不能从根本上解决表示层与业务逻辑层、业务逻辑层与数据层相分离的问题。
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