但是这些新解决方案必须要适应某些清晰定义的系统，这些系统必须已经在一个运维模型下明确地界定出来。
But these new solutions have to fit a clearly defined systems need that has been spelled out in an operational model.
J2EE规范描述了两种事务界定的模型：编程序(programmatic)和声明式(declarative)。
The J2EE specification describes two models for transaction demarcation: programmatic and declarative. Table 1 breaks down the two models.
文章首先对社会支持的内涵进行了界定，并分析了三种作用模型中社会支持对大学生心理健康的影响机制。
This article defines the meaning of social support, and by using three models, analyzes the influential mechanism of social support for mental health of university students.
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